doing, saying, or participating in anything that makes oneself and asshat
derived from 'asshat' (a person who has their head so far up their OWN ass that they are wearing their ass as a hat)
synonyms include: shenanigans, hoop lah, tom foolery and the like.
Guy 1: We've got enough booze to get through at least the first 3 weeks of the semester!
Guy 2: Let the asshattery begin!