This is an appropriate abbreviation of "School Cafeteria" which encompasses the
green beans in the jello, the
mystery meat, and the raisin pot pies, all of which are not very palatable. You could say it's the school cafeteria, but why not use a better word, "crappeteria."
I thought of this thinking of a word that is already in use, "cinemuck" to describe the crud that collects
on the floor in a theater.