1) A random msn term that came into use sometime in 2008. Invented by my friend Eden =), the word basically means that someone is madder than mad. The only thing madder than mad is a dragon. Hence Maddragon.
2) A really awesome dragon that breaths fire and flies. The king/queen of all dragons, it has 100000000000 exp points on Final Fantasy VII and can't die. It is said that if u look at it directly you will burn from the pure awsomeness.
MSN convo: "yo fuzzy, u r so maddragon for getting in with that chick."