A movie marathon that consists entirely of films containing Michael Cera as the main character. These marathons are to be viewed in chronological order by release date.
-Term coined by a proven Master of the Internet, and therefore not my credit.
Dude 1: Hey bro, you up for (arguably cool activity)?
Dude 2: Nah dude, I'm headed to watch a Cerathon at another bro's house.
Dude 1: That blows (arguably cool activity) out of the water! Can I go too?
Dude 2: Sure!