<p><strong>noun</strong></p><ul><li>Slang: an eccentric or irrational person; a nut.</li><li>Baseball: a pitched ball that curves toward the side of the plate from which it was thrown, in a trajectory opposite to that of a curve ball.</li></ul><p><strong>adjective</strong></p><ul><li>Slang: eccentric or irrational; nutty.</li></ul>