The story i heard was that in old wooden sailing ship days, the only fertilizer was manur. The story goes they would ship manur in dry bales. These old sailing ships however were leaky and bales on bottom would get wet and release methane. When someone with a lantern went below the methane would ignite destroying the ship. After losing several such ships, they began stamping the bales "ship high in transport", to keep them from getting wet. Over time this was abreveated. S.H.I.T.
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