Top Definition
A group of insane people who routinely post comments on the ACC blog posts on ESPN. The inmates consist mostly of Virginia Tech, Florida State, Miami, Georgia Tech, North Carolina, and Clemson fans, however fans of other ACC teams will occasionally troll the blog as their team plays well.
I spent a lot of time talking in the ACCylum today.

I failed my class because I never paid attention, I was too busy in the ACCylum.
by asdghapoihv October 19, 2011

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