It is to describe something as mad or something that is so good, you cannot explain it through diction.
This word can be used in many contexts; for example clothes, shoes and other things of significance.

Friend, mate, comes from the word Marra (Geordie Slang for partner) Originally came from Oxclose Community school in Washington.

Nothing, what's a madda with you?!

mad, madda

A presidential marymounter; a "shabam" one that is...

Madda Cheeb is a different way of saying Master Chief. It is used in some cartoons by people or creatures with a speech impediment. It is how a cute or innocent creature might say his name.

It Basically Means Your Mum Simple .