The combination of the words "fucking" and "interesting." Used to describe a person, event, or item that is more than interesting, but less than awesome.
Guy 1: Where did you go last night?
Guy 2: I shacked up with Denise.
Guy 1: Your ex girlfriend? Finteresting....
Guy 2: I shacked up with Denise.
Guy 1: Your ex girlfriend? Finteresting....
by The longstar June 23, 2010