I think it's supposed to be tough/ ghetto. (Emphasis on "supposed to be".) Think those spiky big letters on guys' chests. So not really the kind of thing you see in freewheeling boho places like Portland and Hawaii -- more like suburbs. I dunno though -- haven't seen 'em here either. I can ask my tattoo-artist friend.
Meanwhile, a weird trend I've noticed lately is kids (young men really) purposely going slow on the freeway. (Say 45 in a 65 mph zone.) I've labeled 'em dawdlers. It seems to be some sort of ganja-haze sort of thing. If you look at 'em like "why are you driving like an 91-year-old white guy when you're a 21-year-old black guy?", you get a blank/ blissed-out look in return.
I've seen a lot of 'em though, it seems to be a thing. Not all the same guy, and not all black, but they look like they'd probably hang out together.