Plastic Icing On The Cake Edit Meaning

1.

when catholic high schools try to seem like they're cool by trying to say "we're hip, we're cool."

You see, what Catholic high schools like to do with their rallies and masses is have this plastic icing on the cake. Me personally, would rather just have the cake without any bloody icing, so that we got some more time to play some Mario Kart 64.