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noun Informal.
  1. excrement.
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verb (used without object), pooed, poo·ing.
  1. to defecate.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for poo


interjection, noun, verb
  1. another spelling of pooh
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for poo


also pooh, baby-talk for "excrement," 1950s (cf. poop (n.2)).

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Online Etymology Dictionary, © 2010 Douglas Harper