adj gross; disgusting. Your mother might use it to describe your room, or your girlfriend might use it to describe your whole flat. Or maybe you’re cleaner than I am.
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A poorly-researched dictionary of British Slang words and phrases, written by some guy off the internet.
If I recall correctly, the term “grotty” was short for “grotesque”, and was coined by screenwriter Alun Owens specifically as a slang term for George Harrison to use in the film “A Hard Day’s Night”. At very least, it seems to be the earliest citation of the word I’ve seen.