yawnison Share definition Flag Noun. Yawnison occurs when two people yawn at the same time. A derivative of "yawn" and "unison". She was visibly tired, and seeing her yawn made me yawn, resulting in yawnison. yawnison by bl4cksh33p February 7, 2010 0 0 Get merch Get the yawnison mug. Buy Now — $32.95 See more merch
