f'dunk 

a cock slap to the face

I f'dunked her after I nutted in her face

f'dunk by the almighty f'dunk king April 9, 2003

fdunk 

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.

fdunk by worm March 26, 2004

fdunk'd 

to lay ones balls on another persons head

Max fdunk'd Chao on the bus ride back from Polo

fdunk'd by madore September 26, 2004