British dialect adjective meaning dirty, muddy, or covered with filth and sticky substances.
From clart (dirt/mud) + -y (adjective-forming suffix), creating a descriptive term for things covered in or resembling clart.
Regional adjectives with -y (clarty, mucky, grotty, manky) form a whole vocabulary of dirt that English speakers in different regions instinctively reach for. Your choice reveals where you grew up.
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