in. to complain. (A blend of gripe and bitch.) : Stop gritching all the time.
n. a complainer; a griper. : You are getting to be such a gritch.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Computing Dictionary
gritch /grich/ 1. A complaint (often caused by a glitch). 2. To complain. Often verb-doubled: "Gritch gritch". 3. A synonym for glitch (as verb or noun). (1995-01-31)