Any object, life-form, or action that is so beast (phenomenal) that it is mentally destructive in an either harmful or inspiring way. *It cannot be said for the same reason twice
Ben was skating on a half-pipe when he flipped over on one side of it and landed perfectly on his board.The crowd shouted in unison, "That was Beastageddon!!"
* Ex: You call an action you see today beastageddon. The next day, you see it again. You must find another word to describe it.