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Wiktionary
poop out

vb. 1 (context transitive English) To defecate 2 (context intransitive English) To quit due to tiredness

WordNet
poop out

v. use up all one's strength and energy and stop working; "At the end of the march, I pooped out" [syn: peter out, run down, run out, conk out]

Usage examples of "poop out".

If I start to poop out-at Base Two, say, or in town-that's where we stay.

Civilizations would start to bloom on Earth, and the participants would start to build tremendous structures that were obviously to be messages in Tralfamadorian - and then the civilizations would poop out without having finished the messages.

We'll turn it on when they leave and it should run at least a month before the batteries poop out.

Do you think I went to all this trouble just to have you poop out for the main event?