The absolute epitomy of anything scum/vermin/filth. The highest degree of anything that is scum.
"Look at that Vermin over there. He has just been minesweeping drinks, before stumbling out of The Fudge. Now he is eating a mouldy pizza out of the bin while pulling a shitpig! Outrageous behaiour, now that is what I call scum of the earth!"
"No, that's worse than scum of the earth, that's rudd!"