Both a noun and an adjective, 'lazy ass' is blunt, versatile American slang for someone who won't get off the couch and do anything — or to describe something done with zero effort. As a noun it's the person who promised to help you move and showed up three hours late. As an adjective it describes anything half-done, phoned-in, or thoroughly uninspired. It's direct, slightly vulgar, and totally understood wherever American English reaches.
Stop being a lazy ass and clean the kitchen — it's your turn.
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(slang, vulgar) A person who is lazy.
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(slang, vulgar) Lazy.
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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.