This move is when you prone or crouch behind a teammate or enemy and knife them in the back while yelling "DONKEY PUNCH!"
This can be used to annoy teammates or simply get revenge on annoying teammates
"Huh?" *Turns head around*
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.
Sam: God! i know right! theyre ev-- Wait...
and DONKEY PUNCH!!!! haha! jackass!