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"sloppy, shabby," 1965, American English slang, perhaps a blend of grubby and dingy.
Shabby; squalid; dirty; grotty, scuzzy: I put down in my grungy little notebook that Max Frisch was a wise man/ the peerless, fearless, slightly grungy Grodin to investigate
[1960s+ Teenagers; origin unknown; perhaps sound symbolism resembling gross, mangy, mung, stingy, etc]