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"sloppiness," also "untidy person," 1965, American English teen slang, probably a back-formation from grungy. The music and fashion style that originated in Seattle is attested from the early 1990s.
/gruhnj/ 1. That which is grungy, or that which makes it so.
2. [Cambridge] Code which is inaccessible due to changes in other parts of the program. The preferred term in North America is dead code.