A British intensified adjective meaning extremely dirty — using two near-synonyms stacked together for emphasis. The construction is emphatic rather than technical, and follows a pattern of British English reduplication for emphasis ('dirty filthy,' 'bloody awful'). Used in casual conversation to describe something in a spectacularly poor state of cleanliness.
The kitchen was filthy dirty after the party — took three hours to sort out.
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(British) Extremely dirty; filthy.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.