A fork of Rural Dictionary
A joke in which only the teller of the joke laughs.
Teller: Why don't blind people like to skydive? Person #1: Why? Teller: It scares the heck out of the dogs. Everybody: ... Teller: *laughs* Person #2: That was a bank joke, man.
RFM is an acronym for "Relentless Forward Motion" and is most commonly used amongst long distance runners.
I was an hour into the marathon, but I wasn't thinking about the pain; I was just focused on RFM at that point.