Here's a breakdown of the theory:
* "Pooped out" originated in nautical terms, referring to a ship running out of steam or wind and becoming "pooped" – stuck or unable to move.
* This nautical meaning likely transferred to a more general sense of being exhausted or worn out, as someone who was "pooped out" would be unable to continue.
* Over time, the phrase "pooped out" shortened to "pooped".
Alternative theories:
* Some speculate it might be related to "poop" in the sense of excrement, suggesting a feeling of being emptied or drained.
* Another theory connects it to the verb "to pop," possibly referencing a sudden, unexpected feeling of exhaustion.
However, the nautical origin of "pooped out" is the most widely accepted and plausible explanation.