mcgiffin Share definition Flag kind of inbread hillbilly with bad hygene who performs sexual favors in a form of respect for other men. bob: so how much for a blowjob?david: nothing im a mcgiffin. mcgiffin by bob jefferson the third May 29, 2010 0 0 Get merch Get the mcgiffin mug. Buy Now — $32.95 See more merch