Something extremely cool, another word for awesome. It's the adjective form of swag, which was invented by Shakespeare and used in his play "A Midsummer Night's Dream".
An individual who enjoys learning and does not adhere to social norms, however, they carry themselves in a bold and confident manner. The person who does not fit the prototypical definition of "being cool", but is still a trend setter and doesn't care what other people think and goes against the grain.
He scored the highest test scores and he is still the strongest player on the football team, he is such a swaggynerd.