Gutzmek himself is fairly high ranking here; well he's a Big Mek not a Warboss but he does the same job. Bringing up the rear is I think his name is Nazdreg? Boss of Da Bad Moons.
He is close second but only because his romance with mr nailbrain ROFL I almost pissed myself while playing the orks campaign on retribution but nothing beats the orkiness and sheer Waagghh! mojo of Gorgutz.