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Being in a general bad mood, but the spectrum is wide. It can be from simple disappointment or waking up on the wrong side of the bed to utter nihilism and existential angst for the human race, and everything in between. Possibly of Yiddish origin. One who is shtoompy is usually called a shtoomp.
Person: Are you shtoompy?
Shtoomp: What the hell does that mean?!
Person: Don't be such a shtoomp!!
by GengisKhan December 26, 2010
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