Openning week of WoW (3yrs ago!) on proudmore there was a guild called <Sofa Kings, Sofa King Good>, they were the first guild to be be disbanded by the GMs of the time. I thought it was classic.

But a few of my favorites include:
<And Two Stealthed Rogues> (imagine a multiboxer where this is true)
<Sapped girls cant say no>
<STEAKS ON A PLAIN>
<Murlocs Go RAWRLGRLGLRU>