Wiktionary
poop out
vb. 1 (context transitive English) To defecate 2 (context intransitive English) To quit due to tiredness
WordNet
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?