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.
Also nug·gie,nug·ie.
Origin of noogie
1975–80; apparently expressive alteration of knuckle; see -y2
