A hole in the crotch of a pair of your favorite warn out jeans. Also can be referred to the action of accidentally ripping a hole in the crotch of your jeans.
You better wear some fancy boxers today, these jeans have crotch blow.
A person who KNOWINGLY spreads Crabs by fucking everyone in creation and laughs about it.
Also: A person who cock-blocks or pussy-blocks a friend trying to score a piece of ass. This tends to be the drunk or clueless person of the group and their actions are theoretically kicking thier friend in the crotch.
Beth, that Crotch Cracker! She laughed when I told her I had Crabs!