Wa-Bap 

An onomatopoeia exclamation used to demonstrate the swing and blow of a hit. (Usually from the back, as a sort of sneak attack) see shazam

I snuck up on Joe with the baseball bat, and WA-BAP! Right to the back of the head!

Wa-Bap by Cicatriz December 29, 2004

Wabap 

The act of taking out your dick and putting it on someone else's face, preferably when they are asleep

Yo Chris you should wabap that bitch Kody.

Wabap by Goatskillet April 4, 2017