Wet Wilbur Share definition Flag Ejaculating in ones hand, then runnin up on a fool and slapping him/her in the face with said hand. Yo, fuck that dude. He's about to catch a wet wilbur, son! Wet Wilbur by Dick#Nosyarg April 26, 2010 0 0 Get merch Get the Wet Wilbur mug. Buy Now — $32.95 See more merch