A painful sensation caused by the rubbing of knuckle, fist, or hand to ones head. Generally causing hair displacement and mild cursing.

Relax, in Hungarian.

the act of rubbing one's knuckles on a person's head so as to produce a mildly painful sensation

a painful rubbing of the scalp with the knuckles

Also, a painful blow delivered to the outside of the thigh (along the vastus lateralis muscle, if possible) with the raised middle knuckle of the assailant's dominant hand. The aim is not so much to bruise as to cause rapid and extreme contraction of the muscle, resulting in sudden falling over and cursing.

Gods gift to the devil, the worst punishment Earth can provide.

crumbs, dirt, dog hair, etc. on the floor