Short for Comic Sans MS, an overused (and ugly) computer font.
Teachers usually think that there are only three fonts: Comic, Times and Arial. It's a pain in the ass for Linux/Mac users since Comic Sans MS is a proprietary font exclusive to Microsoft Windows.
Teacher: For tomorrow, write an essay on Greek philosophers. Type it on the computer in Comic 12.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.