flat as a board

(as) flat as a board

1. Physically squashed or flattened. I forgot that I had a muffin in my bag, and it's flat as a board now. My model of a volcano is as flat as a board now that you've sat on it!
2. euphemism, rude Having small breasts. I heard that Amanda's actually flat as a board and just wears push-up bras all the time.
See also: board, flat
Farlex Dictionary of Idioms.

*flat as a board

 and *flat as a pancake
Cliché very flat. (Also used to describe someone's chest or abdomen, referring to well-developed abdominal muscles or small or nearly absent breasts or pectoral muscles-in either sex. *Also: as ~.) Jane was flat as a board until she was sixteen, when she suddenly blossomed. Lucy can mash an aluminum can flat as a pancake with one blow from her heel.
See also: board, flat
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (as) flat as a board
  • flat
  • board with
  • board with (someone)
  • off board
  • the drawing board
  • board
  • big board
  • boogie-board
  • draft board