PG scammer means Private Gallery scammer.
Which means (usually) a guy who posts up multiple fake profiles all over the country on the sole intention of getting people to subscribe to the private galleries which for this he uses jpegs taken and cropped from porn sites in the hope of racking up private gallery credits he can then cash out.
Basically, if you see Bareback on a profile, keep an eye on it. And you will likely see her suddenly turn up in Leeds, then Manchester the following few days, then Bristol then Aberdeen. Then the profile gets taken down.