the.com/filth
Dirt with a reputation, equally at home on floors and in punchlines.
means Disgusting dirt or grime, or by extension anything deemed morally foul or obscene.
from From Old English fylth, the noun-form of foul, literally the state of being rotten — so calling something filthy is just calling it deeply foul with extra venom.
British slangIn some UK slang, the filth means the police.
Filthy richWealth so vast it sounds morally questionable.
Compliment nowThat joke was filthy is high praise among comedians.