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2.
Similar to the "Tea Bag", Clam Slap is the dipping/dragging of a woman's vagina over an enemy's face once the enemy has died. A complete and hillarious way of a female showing a person that their her bitch.
*WoW, Halo, CoD, etc character runs and rubs vagina over dead body's face*

*Player 1* Dude... you were just Clam Slapped.
*Player 2* Yeah... I smell like fish now... -_-
by Jagurara September 21, 2009
 
1.
v. After defeating your opponents in battle, rendering them helpless on the ground, the act of squatting on their face multiple times with your sweaty pussy lips exposed until they dry heave or vomit.
"Amy, that was an awesome fight yesterday!" You fuckin' crushed him!"

Damn straight! Did you see how many times I clamslapped his ugly mug! Muthafucka!"
by Clamsteak February 17, 2011
 
3.
The action of slapping a mans face whilst trying to penetrate him anally to make the pain of said penetration lesser by distraction
For example

Dude its not going in

I WILL FUCKING CLAM SLAP YOU. FUCKER I WILL DO IT DONT MAKE ME
by SGTKM September 20, 2009