A more severe/extreme version of Down Bad or Down Horrendous. The term is usually used to describe someone who hasn't had a
significant other or a hookup in a very long time and is just downright desperate for literally anyone at this point so that they can
experience love, lust, affection, and
everything in between.
Marie: "Hey, isn't this boy cute?" *Shows picture of HIDEOUS boy*
Stacie: *Throws up* "Ew Marie! You are
definitely down
catastrophic!"
Moral of the story is, don't get to a point where you're down
catastrophic.