bazoo

noun2

1. •
   (US, old-fashioned) A simple wind instrument, such as a kazoo or tin horn.

   • It goes against the grain to toot one’s own “bazoo” — 1894
2. •
   (US, slang) A person's mouth.

   • If any galoot in the mob knows of anything that mout block the game ef tuk to a higher court, let him now toot his bazoo, or else keep his jaw to himself now and forever more. — 1881