It means you are bloody awesome, which is a very very good thing. (Just think of Ron Weasley saying "bloody brilliant"!) An awesomenoxious person is top-notch and usually the head of a cool group.
Awesometagious is the combination of the traditional words awesome and contagious and when combined, indicates something which is truly amazing, super-awesome of which you just cant get enough of.
1. That helicopter ride was awesometagious. Lets do it again.
2. That dinner was awesometagious.
3. You will never be as awesometagious as me.