Etymology
The noun is derived from nothing (pronoun, noun) + -burger (suffix forming names of hamburgers served in buns with the addition of specified foodstuffs, or with foodstuffs in place of the usual meat), a metaphorical reference to a burger missing a patty—its most significant component. The word was apparently coined by the American gossip columnist Louella Parsons (1881–1972) in her widely syndicated daily column “Louella’s Move-Go-’Round” of June 1, 1953: see the quotation. The adjective is derived from the noun.
Definitions & examples from Wiktionary (CC BY-SA 3.0).