A girl who doesn't swallow or take a facial during a blowjob.
"Yo I heard you got a bj off that girl!"
"Yeah, too bad she was a dodger."
Good Ass Mother Fucker. The opposite of a BAMF. A gamf is someone who is goody-goody, straight edge, strictly religious, abstinent, etc.
"It's rated R, so I'll wait 'til it comes out on dvd"
"Why not sneak in?"
"I might get caught!"
"You're such a gamf!"