A Butt Diver is defined as a human male who searches the earth's surface with their penis, in search of the anus of another human male. This search is performed with the strict purpose of procurement and penetration of the anus. Afterward, the caught male is then released back into the population so it may then be penetrated by another butt diver.
Have you noticed that a different guy comes out of our neighbor's house nearly every morning around breakfast time?" "Yeah, he's a professional butt diver.