Good answer? Sign In JeanettePNP, MSN, RN, NP 1 Article; 1,863 Posts Specializes in Pediatric Pulmonology and Allergy. Has 8 years experience. The c-Diff smell is just 'special'. Can't really put it into words...smelt GI bleeds whoever said 'metal/nickel like was dead on...Can sometimes smell sepsis and impaction by people's breath odor .. ahhh I'll miss the ER when its my time to go :monkeydance:...Interesting... when my son was about 15 months he suffered from constipation and also had a poopy smell to his breath. I never made the connection.