Very flat: The car was squashed flat as a pancake
[1761+; the form flat down as pancakes is found by 1611]
Extremely level, especially too much so. For example, There are no hills; this terrain is flat as a pancake. This simile dates from the 1500s and has survived its contemporary, flat as a flounder. It is sometimes used, either disparagingly or ruefully, to describe a small-breasted woman.
adverb Totally; absolutely: Some farmers are absolutely flat-ass broke/ It’s not just that. I’ll flat-ass leave her (1960s+)
noun 1. a book spine presenting a completely flat surface. 2. a book bound with such a spine.
noun A prostitute: His prostitutes are well known for being unhooked flatbackers (1960s+)
[flat-bed] /ˈflætˌbɛd/ noun 1. Also called flatbed trailer, flatbed truck. a truck or trailer having an open body in the form of a platform without sides or stakes. Compare . 2. .