Generally train hoppers, bussers, and so on. Kids that travel the states and beyond by foot or train. Mostly punk in genre but there are others.
Hey man, I ran in to these traveler kids that I met in Cali when I was there. Wild.
Seeds of the suburban lifestyle, teenagers who's idolize the homeless, beg for money, spend it on beer, and linger at wifi hotspots to facebook their mothers. You'll recognize them by their black clothing that has faded creating a sepia aura that grants them the dust cloud kind of presence pioneered by Pigpen of the Peanuts gang.
"Those traveler kids have really nice bud. Weird"