Backdoor trooper Share definition Flag A person who, quite frankly, LOVES the cock and takes it in the backdoor route! "Hey mo fo you heard about Michael Barrymore?" -"Yea man he's such a backdoor trooper" Backdoor trooper by Trevor McDonald May 14, 2006 0 0 Get merch Get the Backdoor trooper mug. Buy Now — $32.95 See more merch