Etymology
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poop (n.1)

"stern or aftermost deck of a ship," c. 1400, from Old French poupe "stern of a ship" (14c.), from Old Provençal or Italian poppa, from Latin puppis "poop, stern," a word of uncertain origin. Also "a deck above the ordinary deck on the aftermost part of a ship." As a verb, "to break heavily over the stern of a ship" (of waves, etc.). Poop deck is attested by 1779.

poop (n.2)

"excrement," 1744, a children's euphemism, probably of imitative origin. The verb in this sense is from 1903, but the same word in the sense "to break wind softly" is attested from 1721; earlier "to make a short blast on a horn" (poupen, late 14c.). Meaning "stupid or dull person" is from 1915, but this is perhaps short for nincompoop. Pooper-scooper is attested from 1970.

poop (n.3)

"up-to-date information," 1941, in poop sheet, U.S. Army slang, of unknown origin, perhaps from poop (n.2).

poop (v.)

"become tired," 1931, of unknown origin (see pooped). With out (adv.) by 1934. Related: Pooping.

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Definitions of poop

poop (n.)
obscene terms for feces;
Synonyms: crap / dirt / shit / shite / turd
poop (n.)
a stupid foolish person;
Synonyms: nincompoop / ninny
poop (n.)
slang terms for inside information;
Synonyms: dope / the skinny / low-down
poop (n.)
the rear part of a ship;
Synonyms: stern / after part / quarter / tail
From wordnet.princeton.edu