Rantastic

It basically means when you're about to have a massive rant and it's getting to the point where you are about to explode.

I am so wound up and angry, I feel rantastic!

Rantaster

A collection of simple items with little or no value, like pencils or scraps of cardboard. These items often have great value to the owner and they will keep them for a long time. The rantaster is usually kept safe and is not used for anything even if the items are usually to be used. Generally a Rantaster is unique to the person and completely on of a kind.

I have a large rantaster of gum wrappers.

He possessed a rantaster of random keys with no idea of what any of them unlocked.