noogie

American  

[noog-ee] / ˈnʊg i /

Also nuggie,

noun

Slang.

1. a light blow or jab, usually to a person's head, back, or upper arm and accompanied by a twisting motion, with the extended knuckle of the curled-up second or third finger: done as a gesture of affection or painfully as a prank.

---

Etymology

Origin of noogie

1975–80; apparently expressive alteration of knuckle; see -y ²