[ noo g-ee ]
/ ˈnʊg i /

noun Slang.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019