A horrendously awful fart. Not necessarily the hot burning kind though. Its hard to explain but it's a very distinct type of fart, and if you fart a swamp fart or smell one then the name suddenly makes sense. This usually result from an upset stomach or just not eating well, or eating something that doesn't agree with you.
"Dude I totally just let a Swamp Fart loose... I can tell it is one and I can't even smell it yet..."
"What's a Swamp Fart?"
"...*raises eyebrow*"
"OMG! *grabs entire face* Now I understand!"
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