Well at my high school the popular thing was smoking heroin, and I'n not joking what so ever. Everyone also loved raves, ecstasy and being jocks. I was guilty of all of the above except for the jock thing.
Clothes-wise:
Dudes wore tall white nike socks with tall black nike socks over them layered so you could just see alittle bit of the white, and lots of guys drove trucks and tried to be redneck and went mudding all the time and chewed everywhere they went including classes
Girls tried to be rather slutty, wore yoga pants and other assorted tight clothing, jeans from buckle, those stupid hair feather things, and tanned alot. overall not so bad.