The portmanteau that shippers of Glee actors Chris Colfer and Cory Monteith use as a name for the couple. Although they haven't been confirmed as a couple as of yet, there is quite a bit of evidence that heavily points towards it potentially being true (ie, the fact that they spend an inordinate amount of time together or near each other, their seemingly more-than-just-friendly interactions, and the touchy-feely nature of their relationship, seen in numerous photographs and gifs), and many believe that they are already a couple, and have been for quite some time. Name originates from the amalgamation of both their last names - 'Mon' from Monteith, "Fer" from Colfer.
Cory Monteith and Chris Colfer are just too cute together. I am a total Monfer shipper!
Person 1: Guess what? Another Chris Colfer and Cory Monteith interview just came out!
Person 2: I know, I saw it! Did you see how much Monfer was in there???