Top Definition
n. 1. one who may easily become grouchy or grumpy, even if it is not that often; 2. one who is always grouchy or grumpy.
Anja was being such a Gary Grumpy-Pants because she got annoyed when Adrianna and Alanna wanted to slappa da bass for the picture.
by the girl from ipanema April 29, 2009

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