nigans Share definition Flag An expletive, indicating a mistake or error has been made. Originates from the restaurant "Bennigan's" when the sign is half burnt out. -Dude, you just lit the wrong end of your cigarette -Nigans! nigans by thestatetroopers July 25, 2006 0 0 Get merch Get the nigans mug. Buy Now — $32.95 See more merch