A fork of Rural Dictionary
When an SP (Service Provider: aka hooker, escort, etc) provides a third person recount of her/his services on a review board (i.e. www.perb.ca) under the context of it being from an actual customer's experience.
A shill could look something like this. "Hi, my name's Bob and I'm a long time lurker first time poster. Despite previous negative reviews I saw Brandie and she fucked me rotten, I've never had such a good experience. I think everyone should see her and spend their hard earned money."