Like the answer in the first link, it orginally refered to TV episodes, but nowadays it can really apply to anything that’s gone on long term.
It’s more or less a defining moment of change that comes to something, good or bad (and of course, that’s subject to opinion), that makes it climax. So that everything afterwards is downhill…or at least never again getting up to as high as it was before.
As you’ll see from the second link if you browse a bit, “Never Jumped” is also an option you can choose. One that I think might be the majority of answers in this thread.
Don’t get me wrong, I think that this place is wonderful. Really…More than, actually. But I do think that if closing it’s doors tomorrow, I couldn’t say that it Never Jumped.
In my opinion, I’d have to say that when the SDMB switched to Paying to Post, it was jumping the shark.
What would your opinion be?
Oh, and please don’t turn this into a critisizing topic. It’s not a bitch and moan fest, just some friendly banter on when you think it might have jumped, or never jumped at all.