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A fart so voluminous that after it has been expelled from your system you have to tighten up your belt by at least one buckle. Fartnuckles are best experienced when they're a total surprise. You'd think it would be call a "fartbuckle" but it's actually "fartnuckle," with an "n." And to be clear, it's not "fartknuckle" with a "kn." It's just an "n."
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