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In U.S. Marine jargon, a comparative indicating that something is worthless. In more polite company, see hill of beans.
This equipment isn't worth a rat's ass.

So? I don't give a rat's ass.
by Secret Agent Man September 19, 2003
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Zao: Can I have some gravy?
Peng: Certainly.
Peng: Could you pass the rat's ass please...
Chung: There you go.
by lexicon December 18, 2004
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