The act of playing Halo Reach online on a team slayer, aquiring a magnum or any other pistol, and meleing an enemy player from behind, resulting in an assassination animation.
if done correctly you should see the player's left hand punch the enemy in the back of the head, then a badass knife kill.
Tim: FRICKING CAMPERS!!!!!!!!
Sam: God! i know right! theyre ev-- Wait...
and DONKEY PUNCH!!!! haha! jackass!