>>44582370To abridge a series is literally to shorten it. Kai is an abridging of Dragon Ball Z. In internet lingo, to abridge a series is to do that, but also poke fun at it/add jokes. It's true that TFS started to play it more straight as time went on, but calling it a fandub is not really accurate. The Android and Cell sagas still mess around with a lot of stuff, and they cram in plenty of jokes.
On the far opposite end, your have PurpleEyesWTF, whose abridging style is like trying to identify the bottom car in a pile-up. You might be able to tell what it was, but only just barely- there's too much other shit thrown onto it.