Top Definition
When an angry Matthew becomes irate. Possibly caused by other poeples. You never know what will provoke a grumpy schneiderman but when it goes down people die and being a bone duster, the bodies will be disposed of easily and without question.
Mike: What's going on over there
Pablo: Looks like there's and altercation of some sorts

Mike: Holy crap he just grumpy schneiderman'd his ass let's get the F* outta here
Pblo: roger that
by assman19 October 24, 2011

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