Having recently been to several punk rock shows (read: damp basement noise fests), I'd say: having a blue collar job, being against "the system", doing copious amounts of cocaine and speed on their time off, and having their entire body blasted with tattoos such as a hand flipping you off, a trash can overflowing with garbage, and many insults. I thought this particular kind of people didn't exist anymore, but no, they're still alive and moshing in the basements of most cities.