"The Library", Episode 22 - Oct. 16, 1991

GEORGE: He gave me a wedgie.

JERRY: He got fired the next day.

ELAINE: Why do they call it a wedgie?

GEORGE: Because the underwear is pulled up from the back and ... it wedges in..

JERRY: They also have an atomic wedgie. Now the goal there is to actually get the waistband on top of the head. Very rare.

ELAINE: Boys are sick.

JERRY: Well what do girls do ?

ELAINE: We just tease some one 'til they develop an eating disorder.