Batt vs. Bats

Pieces of fabric or fibre used for stuffing; as for batting or insulation

A shoe.

plural of bat

(informal) Mad, insane.

Example: ‘You must be bats to go out in the cold without a coat on.’;

Crazy; insane; loony; demented; batty.

informal or slang terms for mentally irregular;

Example: ‘it used to drive my husband balmy’;