freak

freak  {n.},  {slang}

1. A good, or well-liked person, the opposite of a square, someone with long hair and who is likely (or known) to be a marijuana smoker or a drug user. Also said of homosexuals.

Is Joe a square, establishment type? — Oh no, he's a regular freak.

2. --- freak

An enthusiast, a person who does or cultivates something in excess.