Popular Prison Terminology

Federal prison has its own working vocabulary. Some of it is official language from the Bureau of Prisons. Some of it is slang that people inside use every day. This glossary collects the terms families, defendants, attorneys, and reporters run into most often. It explains what each one means in plain language. The goal is to help someone read a letter, follow a phone call, or understand a court filing without guessing.

Many of these words carry official weight. "Good time" and "designation" appear in statute and BOP policy. Others are informal. "The hole" and "fish" are slang for things that have formal names. Where a term has both, the formal name is given alongside it.

Overview

The Bureau of Prisons runs the federal system. Most of the acronyms in this glossary trace back to BOP policy or to federal law. The agency operates facilities at several security levels, from minimum-security camps to high-security penitentiaries. The same words travel across all of them, though some terms are more common at one level than another.

Terminology changes over time. The First Step Act of 2018 added a layer of new language about earned credits and reentry. Words like "time credits" and "PATTERN" entered common use after that law passed. Older slang stayed in place alongside it.

The sections below group terms by where they come up. Housing and discipline covers cells, units, and the rules that govern them. Daily life covers food, money, and routine. Legal and process terms covers the words that show up in court records and at intake.

Housing and Discipline

These terms describe where a person is held and what happens when rules are broken.

SHU (Special Housing Unit)

A segregated unit separate from the general population. People are placed there for discipline or for their own protection. Inmates and staff often call it "the hole." Time in the SHU usually means more lockdown hours and fewer privileges.

The hole

Common slang for the Special Housing Unit. The name predates the BOP and is used across most U.S. prisons and jails.

Shot

Slang for an incident report. A "shot" is written by staff when an inmate is accused of breaking a rule. It can lead to a disciplinary hearing and loss of good time. The formal term is "incident report."

Lockdown

A facility-wide restriction that keeps people confined to their cells or units. Lockdowns can be planned, such as during a search, or triggered by an emergency.

Count

The official headcount. Staff count the population several times a day. A "standing count" requires inmates to be on their feet and visible. Movement around the facility stops until the count clears.

PC (Protective Custody)

Housing for an inmate who asks to be separated from the general population for safety reasons. The request is sometimes called "checking in."

Diesel therapy

Slang for repeated transfers between facilities. Long bus or van rides can keep a person in transit for days or weeks. The term carries the sense that the transfers themselves are a hardship.

Daily Life

These terms describe food, money, communication, and the people you live among.

Commissary

The prison store. Inmates buy food, hygiene items, and supplies from it using money in their accounts. "Store day" or "commissary day" is the scheduled time to shop. Spending limits apply.

Bunkie

A cellmate or, in dormitory housing, the person in the adjacent bunk. The word is common across federal facilities.

Kite

A written note or request passed to staff. A "kite" might ask for medical attention, a meeting with a counselor, or an answer to a question. The formal version is the inmate request form, sometimes called a "cop-out."

Fish

Slang for a new arrival. A "fish" is someone fresh to the facility who does not yet know the routines.

Spread

A shared meal made from commissary items. People combine things like rice, chips, and summer sausage into a larger dish. Spreads are a common social ritual.

Road dog

A close friend serving time at the same facility. The term describes a steady companion through a sentence.

Legal and Process Terms

These terms appear in court records, at intake, and in conversations about a sentence.

BOP (Bureau of Prisons)

The federal agency that operates the prison system. It sits within the U.S. Department of Justice. The BOP designates facilities, sets policy, and manages custody.

Designation

The process of assigning a person to a specific facility after sentencing. The BOP weighs security level, medical needs, programming, and distance from home. The result is the prison where the sentence is served.

PSR (Presentence Report)

A document prepared by a U.S. probation officer before sentencing. It summarizes the offense, the defendant's history, and the guideline calculations. The judge relies on it heavily. The BOP also uses it for designation. It is sometimes called the PSI.

Good time

A reduction in sentence for good conduct. Under federal law, an eligible person can earn up to 54 days per year. The credit is defined in 18 U.S.C. § 3624.

Time credits

Earned time under the First Step Act. People who complete approved programs and activities can earn credits toward earlier transfer to supervised release or prerelease custody. These are separate from good time.

Halfway house (RRC)

A Residential Reentry Center. It is a community facility where people serve the final part of a sentence while working or job-hunting. It is a step between prison and full release.

RDAP (Residential Drug Abuse Program)

A voluntary substance abuse treatment program run inside BOP facilities. It lasts roughly nine months. People who complete it and meet eligibility rules can receive up to 12 months off their sentence.

Frequently Asked Questions

Q: What does "the hole" mean in federal prison?

"The hole" is slang for the Special Housing Unit, or SHU. It is a segregated area separate from the general population. People are placed there for discipline or for their own protection. Time in the SHU usually means more lockdown hours and fewer privileges.

Q: What is a "shot" in prison?

A "shot" is slang for an incident report. Staff write one when an inmate is accused of breaking a rule. A shot can lead to a disciplinary hearing and can cost a person good-time credit. The formal term is "incident report."

Q: What is good time?

Good time is a reduction in a federal sentence for good conduct. An eligible person can earn up to 54 days per year. The credit is defined in 18 U.S.C. § 3624. It is separate from First Step Act time credits.

Q: What is a halfway house?

A halfway house, formally a Residential Reentry Center, is a community facility where a person serves the last part of a sentence while working or looking for work. It is a transition step between prison and full release.

Q: What does "designation" mean?

Designation is the Bureau of Prisons process of assigning a person to a specific facility after sentencing. The BOP considers security level, medical needs, programming, and distance from home. The result is the prison where the sentence is served.

Q: What is the PSR?

The PSR, or Presentence Report, is prepared by a U.S. probation officer before sentencing. It summarizes the offense, the defendant's background, and the sentencing guideline calculations. The judge relies on it, and the BOP uses it for designation. It is sometimes called the PSI.

Q: What is RDAP?

RDAP is the Residential Drug Abuse Program, a voluntary treatment program run inside BOP facilities. It runs about nine months. People who complete it and qualify can receive up to 12 months off their sentence.