n. a small toilet. (Usually juvenile.) : Mommy, I've got to go to the potty.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
potty (adj.)
"crazy, silly," 1920, slang, of unknown origin, perhaps connected to potter (v.). Earlier slang senses were "easy to manage" (1899) and "feeble, petty" (1860).
potty (n.)
1942, child's word for "chamber pot," from pot (1). Potty-training is attested from 1958. Potty-mouth "one who uses obscene language" is student slang from 1968.