I Hope They Serve Beer in Hell (2009)

Tucker decides to take an impromptu trip to celebrate his friend's bachelor party. He drags his friend into a lie with his fiancée, gets him into trouble, then abandons him in order to pursue a hilarious carnal interest. This gets him disinvited to the wedding, and in order to get back in, he must find a way to balance his narcissism with the demands of friendship.