pooped

Concise Oxford English Dictionary © 2008 Oxford University Press:
poop1

▶noun (also poop deck) the aftermost and highest deck of a ship, especially a sailing ship. ▶verb (of a wave) break over the stern of (a ship).

– origin ME: from OFr. pupe, from a var. of L. puppis ‘stern’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
poop2

▶verb N. Amer. informal

• 1 (as adj. pooped) exhausted.

• 2 (poop out) stop functioning.

– origin 1930s: of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
poop3 N. Amer. informal

▶noun excrement. ▶verb defecate.

– origin C18: imitative.

Concise Oxford English Dictionary © 2008 Oxford University Press:
poop4

▶noun informal, chiefly N. Amer. up-to-date or inside information.

– origin 1940s: of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
poop5

▶noun informal, chiefly N. Amer. a stupid or ineffectual person.

– derivatives
poopy adjective (poopier, poopiest).

– origin early 20th cent.: perh. a shortening of nincompoop.