Person 1: Look at that cowboy riding that cow!
Person 2: No, a person who rides cows is called a horseboy.
Person 1: Why?
Person 2: Ask whoever came up with the idea that someone who rides horses is called a cowboy.
In the mainly gay, mainly fetish and leather community, someone who 'keeps house' in exchange for bed and board, often with a sexual and/or D/s relationship attached. Compare sugar daddy.