Extreme indulgence in acting like a douche. Usually this action is effected in front of others, without concern on how one is perceived, whom these actions affect or consequences in general.
Guy #1: "You should have seen it, dude. I totally made that virgin fall for me, fucked her and then dumped her in the worst way, in front of the whole party. It was an epic!"
Guy #2: "Sounds like douchebachery of Charlie Sheen proportions."
someone who has totally mastered the art of being a douchebag; someone who is a total dick and loves being a douchebag; mastering concepts such as ass whooping, keg stands, skipping class and vag pounidng
John went to school and learned douchebachery from his fraternity brothers.