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rocky mountain oyster 

Bill: Everyone is eating rocky mountain oysters aka bull testys
Mike: Lets try to find the fag eating his penis
rocky mountain oyster by C.Good October 31, 2008

mountain oyster

most likely originated in Australia or new Zealand, due to one of the main livestock being a sheep

A sheep's testicles
You can't eat mountain oysters...unless you're into that.
mountain oyster by ikayama October 10, 2004