Quote Originally Posted by Siriusly
A knat/thomp = is taking your middle finger back far and holding it with your thumb; then releasing it fiercely onto the skull of your target maximizing pain and the that hollow sound when the skull is thomped.
Yep. That's called щелбан ("дать щелбана").

A nookie/noogie/dutch rub involve grabbing a person's skull in the crook of your arm then pounding it quickly with a knuckle/knuckles or rubbing it till it burns.
Mmm. Don't think so. May be modern kids do so due to american movies.

An indian burn = grabbing someone's forearm with both of your hands touching; then rotating your hands in opposite direction to maximize pain.
Yeah, we did that one.