A "silent, but deadly" fart that is so heinous, it clears an entire room of people in mere moments. Worse, it lingers far longer than a run-of-the-mill SBD, preventing occupation of said afflicted room for several minutes. It's ability to empty an area of all living things is legendary - and feared.
The likelihood of dropping such a lethal package is greatly increased by ingesting copious amounts of oats and/or beans - especially when also taking NyQuil.
The flatulence equivalent of a Neutron Bomb. Also known as the DefCon 4 of SBDs.
Felix: Dude, why did everyone run screaming out of the gameroom? Could it have something to do with the fact the gameroom now smells like a dirty diaper?
Chester: Yeah, that fat slob Bosco dropped a brutal fizzart! That was ten minutes ago, and it still smells like ass in there.
Felix: Damn, that's a fucking Pootron Bomb!