Bum Mouth Share definition Flag Strange creature from Star Wars IV A New Hope. Bum Mouth obviously has a Bum Shaped mouth, and gets angry at luke skywalker in the Cantina. Also, an asshole. Literally. Man that ass is such a bum mouth or Kiss me Leia, I want your saliva to run all through the cracks of my Bum Mouth. I need to lick a good Bum Mouth. Do you really want to french kiss that Bum Mouth? I really love you Bum Mouth, and I love to rub my tongue through your poopy crack. Bum Mouth by Arty Sims December 28, 2008 Get the Bum Mouth mug.