- poop (n.1)
- "stern deck of a ship," c.1405, from M.Fr. poupe "stern of a ship," from It. poppa, from L. puppis "poop, stern," of uncertain origin.
- poop (n.2)
- "excrement," 1744, a children's euphemism, probably of imitative origin; cf. the same word in the sense "to break wind softly," attested from 1721, earlier "to make a short blast on a horn" (late 14c.).
- poop (n.3)
- "up to date information," 1941, in poop sheet, Army slang, of unknown origin, perhaps from poop (n.2).
- poop (v.)
- "tire out," 1931, of unknown origin, perhaps imitative of the sound of heavy breathing from exhaustion (cf. poop (n.2)).