Brando Mouth Share definition Flag A condition a person gets when their jaw is swollen thus leaving them incapable of speaking coherently much like Marlon Brando. Scott just got his wisdom teeth taken out and now he'll have Brando Mouth for the next two weeks. Brando Mouth by J.N. Growling July 7, 2010 0 0 Get merch Get the Brando Mouth mug. Buy Now — $32.95 See more merch