not really. I've noticed recently that my friends use buzia to say 'a kiss'. I suppose it became a kiss by cut off 'k' from 'buziak' (=a kiss, diminutive from buzi). So in this case its very important to use that on the end of the message. Ive never seen buzia as a kiss placed anywhere else in mail, sms or whatever. I don use it, personally.
it also means face, certainly.
btw. 'fase' ) hehe troche chyba spolszczyłeś tę twarz.. )