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An ultimate asshole is the supreme of all tiers of assholism. While there may be the fearsome, mega-asshole, the ranking is still considered below that of the Ultimate Asshole, which is the absolute of all assholes. These people often do not hold back, and show no mercy when crossed. The only worthy opponent of this foe is none other than Chuck Norris and numerous Roundhouse Kicks to the face.
That girl I asked out the other night totally led me on - but she wasn't an Ultimate Asshole like my ex-girlfriend.

My boss is the worst - most definitely the Ultimate Asshole on my team!

Your shitty attitude lately has earned you the title of Ultimate Asshole.
by Ultimate Asshole February 03, 2012
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