Junk Mouth Share definition Flag A term used in reference to that asshole Alan spitting lies. Like pure junk pouring from his mouth. Alan: Yo I got that hotty last night to come back with me.You: No you didn't, junk mouth. Junk Mouth by Jack_of_wades March 19, 2016 0 0 Get merch Get the Junk Mouth mug. Buy Now — $32.95 See more merch