Top Definition
Waking up in a bad mood. Those particularly afflicted are from the southern hemisphere
Who's a grumpy bear this morning?
by mh8748 October 18, 2010
1 more definition
online poker player with more guts than smarts
Man, that GrumpyBear just kept donk'n everyone out of the tournament.
by _Jazzman_ October 23, 2008

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