Pro is also used for prostitute, not as an abbreviation but I believe for professional as mentioned before.
Working girl is also used for prostitute, again indicating her status as a professional.
You're a professional in a sense if you get paid to do it, sportsmen and women for instance "go professional".
They may have mastered their craft before the money started rolling in, but the sponsorships make it officially professional.
posted 11 years ago
Ohh now i get what maneesh wanted to say but could not say. Thanks.