Wedgie
The practice of forcing the gusset of one's (or another's) underwear between the buttocks to create a visible cleft. Particularly amusing if inadvertantly caused by high waisted trousers. Walking with a wedgie is "Chewing cheese".
Variations include Skidders McKenzie, based on the gold watches (q.v.) you would gain from a severe wedgie
written by Da*iel*Ward, approved by Log

Also known as a Melvin. (See: Bill and Ted etc etc)
written by Da*e Lai*d, approved by Susan

Actually, a melvin was in the front, and a wedgie was in the back. A particularly feared prospect was the Atomic Melvin, in which one's stretchy boxer-briefs were pulled so far up that the elastic band could be placed over one's head.
written by Ni*olas *as*oris, approved by Susan

My Pa once yanked my jocks so hard they tore off. That man thought wedgies were the best prank.
written by an*nymo*s us*r, left hanging by Log

How painful this was. Best peformed by a very large kid with strong arms, only on boys though. The basic method is to sneak up behind an unsuspecting person, grab their underpants and pull upwards very hard indeed. Listen to the squeals of pain as their genitals get squashed. Yes it did hurt very much indeed especially when your feet left the ground! Watching other people have it done to them after your turn makes it better. Pity about the poor kid who kept having it done day in day out though.
written by jo*n joh*, disapproved by Log

1. Drag victim to top of tall block of lockers.
2. Secure his keks in vice-like grip.
3. Pitch him off lockers and enjoy rending sound as underpants, testicles and arse-cleft shred themselves.

Happened to me, happened to everyone. Just part of being in the third year.
written by Cl*nt *as*wood, disapproved by Ponky