Verb. A prank where the bully or bullies walks up behind the unexpecting victim, and takes the waistband of his briefs and pulls them up the back, while the victim is still wearing them. Sometimes if the bully is strong enough they can lift the victim off the ground by their tighty whiteys and hang them on a high place by their briefs, such as a hook or basketball hoop. Wedgies are most commonly performed on wearers of briefs (the cool male style of underwear) not on any losers who wear boxers, who are usualy giving the wedgie. An atomic wedgie is when the waistband is pulled over the head of the victim, while he is still wearing them, thus blinding him.
One time me and my two friends: nick and kevn were sleeping over. We are all 13 and in the same classes. Since we all wear briefs, my older brother who is 16 decided to give all of us atomic wedgies. Then he went back up stairs. We all fell asleep with the atomic wedgies still in. Then when we fell back asleep, he came back downstairs, unhooked each of our wediges, and tied the backs of our tighty whiteys together,took all of our clothes off except for our undies, and put us outside and locked all the doors. Since it was a sunday morning, my parents didn't wake up till 11 am, so all the neighbors saw. Then my brothers friends came and gave us each a hanging wedgie. They pulled out briefs through a chain link fence, and twisted a tennis ball in each of ours, so it was extra hard to get out of. We were hanging there for a couple hours until they came and got us down.