Crusty, low class madams in Korea who are usually 50-60 years old or older. They earn a living by trying to lure drunk or naive GIs into coming back and seeing their "nice young girl". The nice young girl usually turns out to be about the same age as the alley troll.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.