Cockpumper Share definition Flag Man who regularly vacuum pumps his penis, enlarging it for display or pleasure. He was so thick, he must have been a cockpumper - aieeya! He's either horse-hung or a cockpumper. Cockpumper by Tigerdave October 26, 2008 0 0 Get merch Get the Cockpumper mug. Buy Now — $32.95 See more merch