Butt Calf
A calf that is so ripped it looks like you have a butt on the back of your leg.
Jon: "I've been working out lately, can you tell?"
Joe: "Yeah, nice butt calves."
Billy: "Nice butt calf"
Dan: "Thank you"
Joe: "Yeah, nice butt calves."
Billy: "Nice butt calf"
Dan: "Thank you"