A renaissance man/woman of horrible things. A Buttbag is a person who is part attention whore, part pretentious
hipster, part fake yuppie, part drama queen, part conceited douche and part self-righteous
asshole.
Perfect examples are: Kanye West, Tom Brady, Christina Aguilera. A great fictional example is Sarah Marshall from 'Forgetting Sarah Marshall'.
Did you see Aunt
Jane's daily Facebook posts about how she's in mourning for her dying
father....but according to her he's been dying for 15 years AND she threw in something about being a great caregiver and how everyone else is a horrible person.
Man she's such a Buttbag.