both sides of the mouth Share definition Flag 1.When a person says things they really don't mean. 2.To not own what one says. 3.two faced "It became hard for Micheal to take Melanie seriously. She talks from both sides of the mouth." both sides of the mouth by sauerpower June 11, 2006 0 0 Get merch Get the both sides of the mouth mug. Buy Now — $32.95 See more merch