1. crotch; being on someone's jock means trying to get involved with someone for his money or his status etc. The best definition can be found on Ice Cube's "Kill at will" in the full version of the song "Get off my dick and tell yo bitch to come here" 2. to sweat someone
English Idioms Dictionary
athlete, student who plays on school teams Doug is a jock - he plays golf and baseball.
