I'll give Magister Snoop Dogg a lick as an apology later.

[Part of it is bullshit. Terezi likes to mess around with people. That means pretending to do things she doesn't need to do. Though, really, she did need a closer lick for that, just to see all the nice details Dave added. If she licked the tank right now she was likely to get a lot of chilly, blurry blue. Maybe just a hint of cute.]

I don't think I'm ready to accept this just yet. I think they're missing something.