bathtub gin

noun1

1. •
   (informal) Gin or a similar alcoholic beverage which is of very poor quality, as if made by a homebrewer in a bathtub.

   • Part of Dallman's "Three Blind Mice" parody follows: / They called us donkey-braying cranks / But all they gave to win our thanks / Was bathtub gin and busted banks / For twelve long years. — 1936