The idiotic look a grown man or woman gets when extemely disappointed with ones self; highly resembles a pouting child about to cry.
That stupid look peyton and eli manning get when they lose a game, throw a pic, etc. I.e. Peyton mannings face he made after losing the superbowl to the saints.
Tim: dude what's with the manning face?
Mark: I lost my job last tuesday, jody left me on wednesday, and some dick stole my bike yesterday...
Tim: that's rough man. The manning face is understood.