General
square john
What does square john mean?
A prisoner who keeps his head down, follows the rules, and steers clear of gangs, hustles, and trouble. Often a first-timer doing white-collar or one-off time who isn't part of the convict subculture. Not necessarily an insult, but it marks you as an outsider to the lifers.
"He's a square john doing two years for tax fraud — won't even gamble on the yard."
Origin
Mid-20th century American prison argot. 'Square' = conventional/straight; 'John' = generic everyman name. Documented in Inez Cardozo-Freeman's prison vocabulary work and earlier in carnival/hobo slang.
Frequently asked questions
What does "square john" mean in prison?
It's a straight-arrow inmate who plays by the rules and stays out of the criminal mix inside.
How do you use "square john" in a sentence?
"He's a square john — keeps his head down and does his time clean."
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