What Is 'Jumping the Shark'? What Does This Expression Mean?

In an online discussion forum, you see the odd phrase "This health care bill debate has jumped the shark. I'm outta here!" You have seen this expression in an email as well. But what exactly does it mean to 'jump the shark'? Well, friends, 'jumping the shark' and its sister expression 'nuking the fridge' are both negative colloquialisms. About.com explains the shark jumping expression here...
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