This word has no meaning whatsoever and that's the beauty of it. It means nothing, it's a place holder.
In other words, it means everything.
Frizen could mean high, drunk, happy, sad, pissed off, horny, etc.
Dude: I'm so frizen I could friz all night
Dude: You aren't frizen, are you?
Dude2: I'm getting there...