What are wedgies?

A 'wedgie' is a colloquial term used by young people, namely, young people in school, to refer to an action taken by some people to cause someone pain. To give someone a 'wedgie' is to grab a person's underpants, and pull them high, constricting the backside with the material of the underpants, and digging into the skin. Wedgies are popular occurrences in Cartoons, to amuse the audience, even now, cartoon characters in schools are still given wedgies by each other, again, mostly in kids cartoons, The simpsonsbeing an exception, which is a cartoon for most ages in general, other than kids. The worst form of a wedgie is of the head and hanging wedgies.
a wedgie to a girl is when they get their panties yank upped by somon else as a joke

It is a form of bullying.