1. A homosexual male.
2. A heterosexual male with a distinctive penchant for anal sex with ladyfolk.
3. A doctor who specializes in anal and bowel conditions and is thus required to frequently rummage around in the rectal cavity of his patients.
"Man, I haven't shit in 2 weeks. I'm so worried about it that I've booked in to see the Bum Troubler tomorrow."