built like a Mack Truck

cliché Having an extremely large, muscular, and physically imposing physique. Refers to American truck-manufacturing company Mack Trucks, Inc. Primarily heard in US. Man, you're built like a Mack Truck! You'd be a great addition to the football team as a linebacker! Did you see that bouncer? He's built like a Mack Truck—there's no way we're getting past him! The Owls' defensemen are built like a Mack Tuck, so our smaller forwards better keep their heads up, or they're gonna get crushed.