Moo Moo Share definition Flag 1) What some people call a mother 2) When a cow speaks twice MOO and MOO Moo Moo fuck off..I HATE YOU.. in context of a mother and daughter/son Moo Moo by rina... December 31, 2003 0 0 Get merch Get the Moo Moo mug. Buy Now — $32.95 See more merch