What Does Blog Mean?

Exploration week for me! My first novel was released yesterday by inspiredromancenovels.com (It's a Christian Romance, "A Hero's Homecoming" - you can also find it on Amazon, B&N, Smashwords). And now I'm blogging. Uh, what, exactly does blog stand for? Is it a contraction or an acronym or just a made up word? Maybe: Big Load Of Goop? Bright Lights of Glasgow? Bring Lots of Grog?