plumbing squirrel Share definition Flag The act of inserting your nut into her vagina, performed during doggy-style anal sex. "Dude, she finally let me give her the plumbing squirrel last night." plumbing squirrel by Harman February 10, 2005 0 0 Get merch Get the plumbing squirrel mug. Buy Now — $32.95 See more merch