funfucker Share definition Flag Someone who ruins the fun by not letting it happen or not taking part in it because of their non-festive attitude. James is a funfucker - he bailed on our hangout just because he didn't want to race. funfucker by B.Tang December 20, 2010 0 0 Get merch Get the funfucker mug. Buy Now — $32.95 See more merch