An American slang threat meaning someone is absolutely done for — finished, in deep trouble, about to face serious consequences. Usually said with full conviction: "Your ass is grass" means the speaker intends to make sure you suffer. It implies both the speaker's power to act and the target's complete vulnerability. Classic playground threat energy, but it shows up in adult confrontations too.
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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.
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(US, slang) One is doomed (used as a threat).
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