flat 36 Share definition Flag a term used to describe a group of really amazing and funny girls that are loved by everyone who not are not whore and bitches. "i totally wish i was like Amy and Lucy, who are totally flat 36's" flat 36 by Lesley Brown June 12, 2016 0 0 Get merch Get the flat 36 mug. Buy Now — $32.95 See more merch