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someone who insists on sharing their bad mood with everyone else, figuratively pissing in their corn flakes.
"She's such a pissimist! I wish she'd keep her bad vibe to herself."
by Michael Kurth July 09, 2007
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The tiny droplets of urine that gets on the toilet seat while pissing
"Is the glass half empty? Is it half full? Doesn't matter cuz it'll just end up being pissimist anyways"
by WhiteRussian523 May 03, 2018
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