Abbreviation for “Anal Commando;” A title given to a person (typically a male) in an authoritative position who abuses his (or her) power. Said person is typically overzealous and uptight (anal).
Principal McVicker is a real Anal Commando! He has a huge bug up his ass.
The AC gave me another detention in class today.
AC Rimmerman is a real cunt-- he nailed me with another fine today.