Recommend me some authors like Christopher Moore?

Ah! You have wonderful taste! Lamb is one of my all time favorites.

Terry Pratchett is practically his British equivalent. His writing style is very similar, although his settings are generally not modern. Mort is my favorite.

Carl Hassan, on the other hand, does modern settings and has characters that are just, if not twice, as over the top hilarious. The only thing is that he doesn't use any fantasy in his books. The best thing I've picked up by him his Nature Girl.

Kurt Vonnegut is another good pick. He's got that awesome dark humor that Moore is known for. Plus I think his books have a little more philosophical meat on their bones. If you've never read anything by him, I'd start with Player Piano.

Finally, Catch 22 by Joseph Heller is a classic. It's pretty long, but you'll be laughing the entire way though.

I hope I could be of some use!

Kurt Vonnegut

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you could try tom holt & irvine welsh, both bit disturbed but welsh more so