1590s, "a 'vocal gesture' expressing the action of puffing anything away" [OED], first attested in Hamlet Act I, Scene III, where Polonius addresses Ophelia with, "Affection! pooh! you speak like a green girl, / Unsifted in such perilous circumstance. / Do you believe his tenders, as you call them?" But the "vocal gesture" is perhaps ancient.
A mild exclamation of disbelief, dismay, disappointment, etc: Oh poo, I dropped it (1602+)
nounExcrement; do, poo-poo •Along with poop, this is a euphemism used by and to children: Zoo Poo garden fertilizer is made from the waste of all manner of exotic creatures (1950s+)
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