Caveman Glue Share definition Flag Sperm; what bursts out of the urethra after materbation or sex. Chase: I wonder how cavemen glued stuff together? Joe: They probably just beat off. Oh CAVEMAN GLUE! Caveman Glue by HomeXGnome June 26, 2009 0 0 Get merch Get the Caveman Glue mug. Buy Now — $32.95 See more merch