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A fart which, when trapped by a tightly tucked shirt, travels upward into the farter's shirt and escapes via shirt sleeves or neckhole.
"That was an unintentional crop dust, man. I had a vertical fart trapped in my shirt, and when I was talking to that hot chick, it leaked out of my arm holes! How embarrassing!"
by austicoatk October 04, 2011
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