The most dirty, messy, or grimy; the superlative form indicating the highest degree of that dull, soiled, or worn-out quality.
Superlative form of grungy, built on the same questionable 1960s-70s origins as the base word, with -est suffix used to show the maximum degree of a quality.
There's something perfect about having a superlative for 'grungy'—the 1990s alternative music scene didn't just celebrate being grungy, it celebrated being *the grungiest*, turning a word for dirty into a badge of honor.
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