Well, that's not quite the version I recall:

A man went to the doctor for a physical. A few days later he is walking down the street with an attractive woman in his arm when he passes his doctor and the doctor says, "I see you're doing well for yourself."

The man replies, "Well, Doc, I remembered what you said, 'Not good... hear me, and you get a hot momma and be cheerful.'"

The doctor exclaims, "That's not what I said. I said, 'Not good hearing... and you've got a heart murmur, be careful!'"