pooped out

[ poopt or poopt out ]SEE DEFINITION OF pooped out
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

"tired," 1931, of unknown origin, perhaps imitative of the sound of heavy breathing from exhaustion (cf. poop (n.2)). But poop, poop out were used in 1920s in aviation, of an engine, "to die." Also there is a verb poop, of ships, "to be overwhelmed by a wave from behind," often with catastrophic consequences (see poop (n.1)); hence in figurative nautical use, "to be overcome and defeated" (attested in 1920s).

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.