3 more definitions
Something to say when you are very angry.
"Ah Fwack I left my keys in the car!"
by myfajahas400children December 28, 2009
The act of hitting someone with your penis in a forceful manner. Usually performed facing your target, in a trebuchet motion.
"Dude, stop fwacking me! I'm trying to sleep!"
by oranggejuice November 13, 2014