The dirty stench you are sometimes subjected to when you walk past a really fat person, its just like a dirty urine smell, like they can't wash under the folds of fat. Makes you have to hold your breath when you walk past.
A: Dude, can you smell that?
B: We just walked past that fat old woman, it was probably her.
A: I guess, it was a stinky piss smell now you mention it.
B: There's a word for that, I think it's stinky fat piss smell?