A female who derives pleasure from watching the crotches of others in a public setting in an attempt to ascertain the size of a man's penis. Many females crotch watch for sport, while others crotch watch to determine whether they desire to have sexual intercourse with the prospect. It is said to be quite popular to crotch watch african americans.
Joe: "Dude, I keep catching my girlfriend crotch watching random black guys."
Lenny: "Maybe it's because you have a small dick, dude."