yayayayayayayay Share definition Flag Saying the word "yay" repeatedly (sometimes to the point of annoyment) especially when you are over-excited and hyper. OMG! I got a Snuggie for Christmas! Yayayayayayayayay! yayayayayayayay by ILuvVocab January 11, 2010 0 0 Get merch Get the yayayayayayayay mug. Buy Now — $32.95 See more merch