LOL-a-bye Share definition Flag A joke so funny that it will make you laugh yourself to sleep. Dude, I heard a joke yesterday that was a total LOL-a-bye. I laughed so hard I think I may have literally dozed off for a while. LOL-a-bye by Synthetic42 March 17, 2009 0 0 Get merch Get the LOL-a-bye mug. Buy Now — $32.95 See more merch