Somebody who is attracted to the idea of God, or to an equally god-loving person.
We met in church, and hit it off right away. We've been going out for at least a month, but I already knew he was the one, because we're both Theosexualls.
The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.