An upgraded version of mad cunt. Originated in Australia and was named after a person who has all the characteristics of a mad cunt, but brings more to the table. A maggs kent is a person who is extremely well-liked and has a large following. Usually has a large penis and gets all the ladies. Is now the highest possible praise you can denote to someone.
mike: "hey man, did you meet bob last night at that party?"
hunt: "nah i didnt why?"
mike: "oi he is a maggs kent, il introduce you to him sometime"