Define Gamechanger Meaning

An event which occurs out of the blue. There is no possible explanation for it and never will be. This event is so unexpected that it is not even part of the odds. People are extremely shocked by these rare events and often are left speechless or talking nonsense. This word is often used incorrectly in such ads as the one for PS vita.

A strong cup of coffee or other beverage containing large amounts of caffeine which has the power to improve one's mood significantly or turn one's day around (changing the game). Not to be confused with a wildcard.

1. A term used by fans of a TV show/work of fiction to describe an attempt by the writers/creator(s) to twist the narrative on its head by introducing something so completely unexpected that it puts a completely new spin on things and forces the viewer to assess thier opinion or perception of where said fiction/show is ultimately headed.
The most effective gamechangers are those which cannot be predicted using the clues introduced to the narrative so far, and leave the audience completely and utterly confused.

A gamechanger can, in the minds of some fans stray extremely close to Jumping the Shark, however a gamechanger is often seen as a positive if it enhances the quality or intrigue in a work of fiction.

Words also commonly associated with a gamechanger when they are shown, are WTF and OMG and Holy Shit.