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peepee

[pee-pee]Baby Talk.
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verb (used without object), pee·peed, pee·pee·ing, noun
  1. pee2.

Origin of peepee

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for peepee

1923, childish reduplication of pee.

Online Etymology Dictionary, © 2010 Douglas Harper