This has been a long running theme of discussion on the site. I can't say I've ever literally smelled a cologne or perfume that smells like "poop" but there are some floral notes and animal notes that give off, what could be perceived as fecal-like notes...
The often discussed "civet" note which, If I'm not mistaken is the secretion from the anal glands of some animal... is a note that has often been responsible for the "fecal" comparisons. Fragrances strong on civet often give off a funky type odor.. an animalistic pungent one <depending on how well it's been smoothed out by other notes>
I have smelled fragrances that have a strong "body odor" or sweat smell, but none I can truly say.. smell like "poop".. thankfully..since it's an aroma that people take great steps to mask or eliminate!