Curb
To pleasure a girl with one's chin. This is usually only effective if one has a ridiculously oversized mandable and a really creepy and fucked up sexual partner. The common sign language for this is to make a vagina with the index and middle fingers ( c'mon you know how) and then to place this over one's chin, thus signifing curbing.
Dude, did you hear about that girl getting curbed?

Yea man, she got fucked by the Crimson chin alright!