69 Share definition Flag A number, that when immature people hear, causes everyone to laugh like idiots. Teacher- So the answer, is 69. Idiot1- SHE SAID 69!!!! Idiot2- THATS A SEX THING HAHAHAHA!!! 69 by RandyNewmanATTACK December 16, 2014 0 0 Get merch Get the 69 mug. Buy Now — $32.95 See more merch