Liposuction fat

A mixture of fart and sulfur. It was so bad I could puke!

I had a serious case of chickenpox right before I turned 21. All over crust, mouth, eyelids, ears, groin.....I smelled like I was rotting and eventually was hospitalized for two weeks. The nurses took turns or drew straws or something. I pretty much went out of my mind for awhile.

On a positive note, afterwards, I didn't have any kind of acne for like 5 years.

Coffee ground emesis, and stool from a patient dying from a GI bleed. Absolute worst smell I have encountered in my life. It's also a smell that sticks to you.

Ammonia. It doesn't technically smell bad, but it stings and does horrible stuff to you. Had the misfortune to use a lot in Chemistry and ended up puking from poisoning.

That and diarrhea and diarrhea farts.

Vegemite

Many years ago, I went to a plant manufacturing cooking oil. We were installing new fatty acid deodorizers. Damn, they needed them.

Pulp and paper plants are pretty nasty; and food processing plants with wet/rotting grains are vile. I used to get highly amused by auditors puking. Raw sewage generally smells better - lol.