When you are more than besties and will always be there for each other. You laugh at each others super lame jokes all the time! Ultimate Super awesome mega besties usually don't know how they became friends, they just upgraded from stranger to Ultimate Super Awesome Mega Besties
John: We are friends right?
Lisa: Of course! no im wrong
John: So we arent friends?
Lisa: No I meant we were Ultimate Super Awesome Mega Besties
something that is cooler than can be described by "cool" "whoa" "awesome" "amazing" or any other singular word. Therefore, requiring three words to describe it's coolness/amazingness
"Did y'all see that new movie? It was mega-whoa-awesome!"