Definition
That one person in recovery who won't shut up about their supposedly hardcore past, despite everyone knowing they're about as tough as a marshmallow in a microwave. Their war stories are 90% exaggeration and 100% compensation for deep-seated insecurity. Usually spotted dominating group therapy sessions with tales that mysteriously grow more dramatic each retelling.
Example Usage
Don't mind Marcus—he's just being a rehab gangster again, claiming he ran the whole city when we all know he worked at GameStop.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Rehab%20gangster&defid=12669995)
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