mashed sammich Share definition Flag A mashed sammich is when you take a piece of bread and smash it in your hand to eat like a sandwich. Nothing on it, just bread. Boy: Grandpa I'm hungryGrandpa: *smashes a piece of bread* There ya go, mashed sammich. mashed sammich by ShitDemonFromDogma June 24, 2024 Get the mashed sammich mug.