It refers to an old Navy Chief's curse aimed at the officers. It is an acronym for Shit In Your Flat Hat
by J T Kelly November 17, 2006
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by ovomaddy February 13, 2021
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by sam.r September 4, 2009
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She’s cool. Siyshore
by Siyshore xox March 2, 2021
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by Awoir July 17, 2004
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