a complete asshole. someone who sucks really really bad and doesnt give 2 shits about other people

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Assbag is a common word used to explain the level of douchbaggery that an asshole has sunk to.

Same thing as a douche bag. A bastard that deserves a dirty ass whipping. A person that is one massive bag of dirty ass.

Fan-modified catchphrase of Zeddicus Zu'l Zorander of Legend of the Seeker/Sword of Truth. Applies to any situation.

A couple of friends and I were trying to think of a way to properly describe a guy who was such a jerk. We couldn't decide if he was an asshole or a douchebag. Thus became, Assbag!

The epitome of all asses; a derogatoy word (noun) typically utilized in defiling a particular species of homosapien expressing excessive abnormal behavior.