Super-busy
(adj.) Sarcastic term used to describe the state of feigning a full schedule of events when one, in fact, has no obligations whatsoever for the period of time in question.
Friend 1: I can't hang out tonight, I have a million things to do because I am super-busy.

Friend 2: Wow, I did not realize you had so much going on right now.

Friend 1 then goes home and sits in front of the tv or reads a book for the rest of the night.