flat as a board and easy to nail

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.

The famous line from Judy in sleepaway camp

a non-flattering way to call someone a flat-chested girl.

flat as a board and never been screwed

A flat woman. Compare to pirate's dream. From an unwarped board.

Flat as board and easy to nail!
First coined in 1903 by H. Cleveland Lowenbrau to describe the Baronesse of Eastern Slovovia