Most of the post was dedicated to tracing the origins and rise of "shitgibbon." The end of the post, however, catalogues insults in the same vein:

wankpuffin, cockwomble, fucktrumpet, dickbiscuit, twatwaffle, turdweasel, bunglecunt, shitehawk

And some variants: cuntpuffin, spunkpuffin, shitpuffin; fuckwomble, twatwomble; jizztrumpet, spunktrumpet; shitbiscuit, arsebiscuits, douchebiscuit; douchewaffle, cockwaffle, fartwaffle, cuntwaffle, shitwaffle (lots of –waffles); crapweasel, fuckweasel, pissweasel, doucheweasel.

Thanks for expanding my vocabulary!