Green and muddy

We walked through a pretty muddy field and my mom started saying something along the lines of, "Why is it half a man and half a woman?" I asked who. Who was half a man and half a woman? I kind of knew that she was asking why the field was part grass and part mud, but I thought it would be fun to pursue the other track. She said she wasn't sure, something something, mumble mumble, and then, "But I'm a complete American." There you have it.