It's exactly what i sounds like.
It should play a new animation instead of just the old fist animation, and should play a slap sound. This would be really fun.
It would be awesome if you could:
-Make the player tumble towards the opposing direction of the smack
-Do some damage
-Red mark on face (IF POSSIBLE, and optional)
-Different materials to smack with (just an emitter when you hit someone would be cool)
Smack cam!