Old expressions that no longer apply

Cold enough to freeze the balls off a brass monkey.

(I cant say/write this in German, but this is the “approximate” English translation.)
Born dumb and stayed that way.

(Back to English)
Wiggle like that belongs on a hook.
Posted this before, but the minkey was the brass triangle the British sailors stacked the cannon balls on. When it would get cold the brass would contract and the cannon balls would roll off.