In the UK at least 'A Guy with Camera' or GWC, is a stereotype of the 'dark side' of photography. A GWC is someone who not necessarily owns a camera for the sake of but usually attends group shoots and shoots models as an excuse to see (usually) young ladies in a varying state of undress. (GWC, can also refer to 'gal/girl with camera', but the stereotype is guy, so GWC is technically non gender specific!).

Although not necessarily a danger, they can be initially identified by:

• Lack of improvement and development of skills (and desire to learn)
• An eagerism to shoot higher levels; implied, nude, topless, erotic, adult etc.
• Inappropriate behaviour, both on and offline, such as lewd comments about models appearances and sexualising the experience.
• Awkward instructions which may not present a model in a flattering way.
• A lack of interest in the 'art' and technicalities of photography, framing, exposure retouching etc, more take as many pictures as possible.

Over time however a GWC may develop their skills and become a competent photographer, and even transition away from being a GWC. If they overstep the boundary and go from 'they're ok but a bit pervy' it can become a serious legal matter.

Some models are OK working with GWCs and find them a necessary part of the job that pays the bills. As long as they have good references and are respectful, they have no issue, they can be seen in a similar vein to an amateur or a beginnner.

As of Uncle Bob, a GWC can be an Uncle Bob, but doesn't necessarily have to be an Uncle Bob.

On a side note, whilst searching for this topic I did find this article which is a perspective from the US which is very similar but a bit harsher, although this line sums it up quite well.

Often times, the GWC doesn’t give a hoot about photography, bettering his work as a photographer, or actually achieving anything as a photographer.