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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.
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