Activist Judges

I don't know about you, but I have been hearing the term "Activist Judges" bandied about a lot lately, particularly by the right-wing radio hosts and Republican lawmakers. I found myself wondering what the users of the term defined as an Activist Judge.

Is it "those judges that go beyond the Constitution, or interpret it ex-treme-ly loosely, to reach their decisions"?

Or, it is "judges who make decisions that pleases the Left more than us?"

And, if activist judges are a bad thing, why all the praise from the right for the "10 Commandments" Alabamba judge?