/ Thesaurus / P Synonyms of poop out Find synonyms for: Verb1. poop out, peter out, run down, run out, conk out, tire, pall, weary, fatigue, jadeusage: use up all one's strength and energy and stop working; "At the end of the march, I pooped out"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language