What is Ten Pistachio Shells!!!?
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Generic expletive. Usually indicative of a sudden extreme emotion (happy, sad, surprised), and often used in situations where an outburst cannot be contained, yet swearing is not allowed.
"My computer just ate my hard drive! With all my porn! And Grandma's in the next room! TEN PISTACHIO SHELLS!!!"
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I'm not exactly sure what used gravy is, but the concept apparent from the term.
It could be gravy that was on something, congeale..