A fun fucker - a person that fucks the fun out of everything.
Thanks, Roy, you fun-fucker...now I wont bother to spend $8 to see Clint Eastwood die in Gran Torino
by 私はTodd February 06, 2009
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.
by B.Tang December 17, 2010