An anagram for A Very Potter Musical. It's a musical spoof of Harry Potter books/films 1-4. The musical stars Darren Criss (Blaine from Glee.) It was written and performed by a Michigan theater company named Starkid. You can view it, it's sequel (AVPS) and other Starkid productions on YouTube.
Person 1: Have you seen AVPM?
Person 2: No. What's that?
Person 3: Totally Awesome! You need to watch it.
The abbreviated term for the hilariously magical musical adaptation of the Harry Potter series known as "A Very Potter Musical"
The abbreviation, AVPM, is most widely used on the internet because "A Very Potter Musical" is a long title, and we don't have time to type the whole thing out.
Me- "Hey have you seen AVPM?"
Friend- "Uh YEAH! Its totally awesome!"