A reference to a single episode of of the animated Matt Groening show, Futurama. The episode in question has a decidedly heart breaking and emotional ending that comes from nowhere. The term refers to getting caught off guard by an unexpectedly sad event that you didn't see coming.
I was talking to Sandy the other day on our date, and she was just kind of chattering on, but then she started talking about her Dad dying of Cancer. It got to me man, total Fry's Dog moment.
by Gueop June 20, 2011