Moo Moo Cow Hump Share definition Flag A returning term of endearment for "Boo Boo Kitty Fuck." Alex: "What's up Boo Boo Kitty Fuck?"Sarah: "Nothin', Moo Moo Cow Hump." Moo Moo Cow Hump by BooMooHumpEff May 8, 2010 0 0 Get merch Get the Moo Moo Cow Hump mug. Buy Now — $32.95 See more merch