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1.
(revival)
The scene was so preposterous that many believed it to be an ill-advised attempt at reviving the declining ratings of the flagging show... since then, it has become a metaphor that has been used by U.S. TV critics and fans to denote the point at which the characters or plot of a TV series veer into a ridiculous, out-of-the-ordinary storyline.

The term Jumping the shark alludes to a scene in the TV series Happy Days when the popular character Arthur "Fonzie" Fonzarelli, on water skis, literally jumps over a shark.

A phase in a relationship to rekindle romance after a betrayal or tort action.
My boyfriend has been going so overboard on the gifts and little extras since I caught him with that other girl, every time we go out it is like "jumping the shark".
by Kelly October 01, 2007