defecationEnglishOxford English Thesaurusdefecation noun excretion, passing/discharging/excreting faeces, evacuation of one's bowels, opening one's bowels, going to the lavatory; bowel movement, BM; informal number twos, poohing, whoopsies; vulgar slang crapping, crap, shitting, shit, dump.defecation Oxford Dictionary of English