A category 3 level of being down bad, being down cataclysmic can only be used to describe someone willing to go so low that one would have to otherwise be insane to commit such acts. Down Cataclysmic is so bad that one does not even need to respond with a sentence, they can just say "Down cataclysmic".
Similar to down horrendous and down bad, but much much worse.
"I took an 8 hour plane ride and $140 dollar Uber to see her, but she was busy that day, so I jerked off to her Bitmoji in the public bathroom and then went home."
"Down Cataclysmic.