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1 vb. To run very fast wearing only one's boxer shorts. 2 adj. To be in one's grundies - to be wearing only one's boxer shorts. 3 noun. Grundyboy - James Halsall. 4 adj. grundy - you can replace pretty much any word with grundy and come out with something that sounds like it should make sense, but doesn't. 5. adj - grundy. to be as of or pertaining to the action of running very fast wearing only one's boxer shorts.
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