Backdoor Tomahawk Share definition Flag A backdoor tomahawk involves giving anal with a really big penis. Chris:Dude!What are you doingBrandon:Oh uh I just gave your mom the backdoor tomahawk. Backdoor Tomahawk by CHOPSSTEWY April 30, 2009 0 0 Get merch Get the Backdoor Tomahawk mug. Buy Now — $32.95 See more merch