The permeating aroma that tends to smell of sweat, arm pits and ass that surrounds an overweight person.
We were all crammed on the bus and I almost threw up from the fat smell coming off the lady standing next to me.

Man did you forget to take a shower or is that just your fat smell?
by TheDeathParade February 26, 2012
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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?
by WeThree November 05, 2010
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girl: i love me a big boy.
friends: ayes until he have that fat boy smell
by bearrrr1111111 February 02, 2021
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