[ME. a. OF. pupe, pope (c 1400 in Godef. Compl.), F. poupe = It. poppa, Prov., Sp., Pg. popa:—late L. *puppa for L. puppis poop, stern.]
1. a.1.a The aftermost part of a ship; the stern; also, the aftermost and highest deck, often forming the roof of the cabin built in the stern.
†b.1.b at poop, in (the, one’s) poop, of the wind: Astern. Hence fig. Obs.
c.1.c transf. A cabin built on the after part of the quarter-deck; a round-house. rare.
†2.2 transf. The dickey or seat at the back of a coach; the hinder part of a man or animal, the posteriors, rump. colloq. or vulgar. Obs.
3.3 attrib. and Comb., as poop-cabin, poop-deck, poop-end, poop-ladder, poop-rail, poop-staff; poop-break, the front of the poop of a ship; poop-lantern, -light, a lantern or light carried at the stern to serve as a signal at night; poop-ornament Naut. slang, a ship’s apprentice; poop-royal, the deck forming the roof of the poop-cabin; a top-gallant-poop.