About that life (bout that life) is a slang term used to describe someone who's down with whatever activity is being discussed. Most Hip Hop artists use this slang to refer to the criminal underworld. If someone's selling drug or killing, then they'd say they're about that life. When someone says "you're not about that life," they mean the individual they're talking to is not down for whatever activity is being discussed.
- "You ain't about that life" - n*gga who's about that life.
- In Rich Homie Quan's "Bout That Life" song, he raps "I'm bout that life (Okay) - Kill a n*gga all day - I might tie him up - Beat him with that ball bat.