slang An honest, respectable, and law-abiding man. Used primarily in criminal and prison communities. The key is to find some square john to take the fall for you when the feds finally catch on to the scheme. I know you can't understand how I can sleep at night doing what I do. But see, I look at a square john like you, a slave to your work and your mortgage, and I think you're the crazy one.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See square john
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.