What does PROFESSIONAL mean?
 

That one does it for money or does it for money very fucking good?
Does it mean one learned a lot, practiced and doing it for money or
just opened a Kinko and sell Xerox copies?

usually money :1orglaugh

but I believe it means its your area of expertise in a specific trade and it is how you make your income.

Neither :)

It should mean you act professionally IMO

Then what does Amateur mean?

Can't be 2 people doing it badly for money. LOL

Proof Session Anal

You do just what you have to do to best accomplish your job or your aims and don't waste time or effort doing things that hinder or don't benefit the end result that you want to achieve.

It means you are at the 'Shap' or 'Robbie', level of kicking ass and taking names.
:pimp

Untill that it's amateur?

A professional is an amateur who has read Paul Markham's e-book.

Around here, it seems to mean anyone with a GFY account...