When you are a mix of grumpy and sleepy. Hence, being grumpy due to being sleepy.
Andrea: I'm tired, and getting grumpy.

Casey: It's okay, here's a hug.
Andrea: Get off of me, I hate when people touch me when I'm slumpy.
by DickKnuckles March 21, 2016
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A poor young polar bear, who can only be saved with the use of FAP Energy. Hence the phrase, 'saving Slumpy.'
Time to save Slumpy!
by wrongowrong October 30, 2012
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Feeling sad, crapy and crummy just having a slumpy day.
(A girl wearing a jogging suit and her hair is up in a bun)
"She's so slumpy today I wonder what happened"?

(Someone just being lazy)
"I'm going to be slumpy today just because".
by Justine Snell April 17, 2014
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Everything and anything so horrifically bad that you could imagine possible to say about or to another girl.
Oh my gulosh, that slumpy just put her hand in my face like she's the shiznat or something!
by Lexis Baker January 1, 2006
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A soft turd that slumps when it hits a hard surface and has a low angle of resolution. If landing in water spreads out and floats, needing a courtesy flush. Very smelly.
I'd rather step on a horse apple than in a cow slumpy.
by John 999996 August 28, 2008
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adjective; To describe an undesirable outcome of an event. Also this word can be substituted for words like shit and slut as a more desirable way to swear in front of family members.
D: How did you go in the Sniffy assignment.

K: Lets put it this way, my performance was slumpy.
by poodlesdoodles January 11, 2007
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Slumpy (singular) or Slumpies (plural) -

Most often used in marketing and media interpellation, a slumpy is a socially liberal, urban-minded, physically conservative yuppie between the ages of 18 to 36.
"This used to be my 'hood. But since its gentrification 10 years ago, er, excuse me, since its 'revitalization,' its become an anthill of latte-sucking, yoga mat-toting white slumpies."

yuppies gentrification marketing business demographics revitalization neighborhood yoga white Anglo professionals
by Simon Moya-Smith February 9, 2012
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