Past tense of 'pee,' meaning to urinate.
Pee is likely onomatopoetic or a euphemistic shortening, possibly related to the letter P, which was historically used as an abbreviation for bodily functions. It emerged as informal English slang in the 17th-18th centuries.
The word 'pee' is so new compared to other bodily function words that it only became common slang a few hundred years ago—before that, people used much fancier or more direct terms.
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