Jailfriend

This can be used for either a male or female when their significant other is currently incarcerated. When they go on a "date" they will get the customary visit with the inmate. People that consider a jailfriends a real relationship are usually either major losers or fucked in the head so bad that somebody in the outside world wants to be with them.

Bob: Is your wifes friend Tina single?
Scott: Yes and no. She has a Jailfriend she goes to visit every once in a while.

That chick can't find a normal guy to put up with her bullshit so she went and got a Jailfriend.