More of the outside aspects of drug culture bleeding into children's gear.
"Do unto others then split." If my kid came home wearing that, why, it'd go straight in the garbage. I did unto you, so what's your problem?
Note that "truckin'," as per the unbearable Grateful Dead song, does not mean "operating a motor vehicle," but means "leeching a ride from someone who operates the vehicle, possibly at his own expense."