The floral ones are the fucking depths of tartarus having taken a huge foetid diseased, dysentery shite, rolled it up in a bun and stuffed it up a dead dog's bloated, almost ruptured with corpse-bloat in which a plague-ridden sewer rat has crawled and died having first given itself a shower in a cholera victim's putrescent leavings.
I've smelled fouler, sure, but only in the context either of excrement of some form, or some of the more abominable sulfurous, arsenical or selenium-based entities that have slithered their way out of a lab flask. Or acrolein, isocyanides. Oh and durian fruit...that smells so ugly that its banned on flights. And a few pieces the size of a quarter of a large orange or grapefruit of medium size, is enough to stink out an entire tall building if stuffed into the airvent duct system and a chunk tossed in a bin higher up. That stuff is on the borderline between fruit and a chemical weapon. Sulfur mustard lite edition. Although it smells partly reminiscent of arsine and the smell given off by white phosphorus burning without the burning acidity of P2O5. Garlicky, rotten leeks and onion plus the smell of arsenical pyrites when struck, plus some overtones of that nasty smell from a sweaty hand holding copper coins. All rolled up in sewage and sulfurous nasties of the mercaptan variety.