What do you call a cow with 3 legs?

The joke “What do you call a cow with 3 legs? Lean beef” is a play on words that uses the term “lean” in a dual context. In one sense, “lean” refers to the physical posture of a cow that might be off-balance or tilting due to having only three legs. In another context, “lean” describes meat with a lower fat content, which is often considered healthier. “Beef” is the meat that comes from cows.