Boys and Girls

We are watching our neighbor's dog this weekend. Her boyfriend comes and stays occasionally which he happened to today. S discovered this while he was outside whistling, a very loud noise he makes, and thought he heard her in there. I told him he could go knock and see.

He comes back and says, "There IS a guy there!" I said, "What guy?" He says, "M's"... then after some deliberation of searching for a word "boy."