single nut Share definition Flag were a guy has only 1 nut in there sack. like how a girl or guy can have 3 tits. WEIRD! as jimmy pulled down his pants infront of his girl she noticed he had a single nut single nut by lolshocks.com December 18, 2012 0 0 Get merch Get the single nut mug. Buy Now — $32.95 See more merch