Rocky Mountain Oyster 

edible bull testicles

those were some good rocky mountain oysters at the bar last night.

Rocky Mountain Oyster by Hugh G. Dick July 2, 2008

rocky mountain oyster 

a dish that is also known as bull testicles

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