A lingering smelly fart
You farted 10 minutes ago? Yea. Jesus this butt fog just wont go away!!
fart, flagalance, to bust ass, pretty much when you blast a fog horn in your pants and crop dust a layer of fog behind you creating low breathabilty possibly causing nausea leading to poor visability
After Betty destroyed the bathroom, she walked down the hall leaving a musky layer of butt fog causing fellow co workers to feel sick.