From Wiktionary, the free dictionary
From asshole + -ness.
assholeness (uncountable)
- (informal, US, vulgar) The state of being an asshole.
2011, David Smith, They Ate Peaches[1], page 80:Sincere assholeness is not my style so I am just a simple asshole who is not really funny but it is what it is and so I am.