Wum Waisin Share definition Flag The favorite ice cream flavor of a dim-witted narcoleptic. "Oh dear mommy, won't you pwease take me to Carvel for some wum waisin ice cweam before i fall asweep." Wum Waisin by Colediggy February 25, 2011 0 0 Get merch Get the Wum Waisin mug. Buy Now — $32.95 See more merch