moo-yeah Share definition Flag 1)a thrusting movement used during sex, usually used while saying the word. 2)a word used to describe excitement. 1) guy- Hey *starts making out* girl- Moo-yeah!!!! 2) We're going to Waterworld MOO-YEAH!!! moo-yeah by hpfreaks August 23, 2007 0 0 Get merch Get the moo-yeah mug. Buy Now — $32.95 See more merch
