look up any word, like donkey punch:
 
1.
a cock slap to the face
I f'dunked her after I nutted in her face
by the almighty f'dunk king April 09, 2003
 
2.
When you're getting a blow job and you slap the chick on her forehead w/ your cock
She was giving me a blowjob and i whipped it out and fdunked her.
by worm March 26, 2004