The term was first coined - CROTCH LAMBADA - at the University of Georgia in 1994. It was named after the movie - LAMBADA - THE FORBIDDEN DANCE. The term refers to dancing very closely together while rubbing crotches together. It was later simplified and spread as "CROTCHING". Its more accurate and descriptive than the more popular term "GRINDING". The vernacular is usually used as a verb but can be used as a noun as well.
Chief Wiggum: Well if it isn't the doobie brothers.
Lenny: Uh oh, crotch the weed.
(Homer Simpson crotches it)
Chief Wiggum: Smell any drugs, Sergeant Scraps?
(Dog bites Homer's weiner and testes).