I agree with the anonymous poster that clear cases of plagerism are a different animal, and not included under the usage of "XP whore" that I've seen. Neglecting to give credit, whether from thoughtlessness or a lack of ethics, does come under "XP whoring", and although it is sometimes casually referred to as plagerism, that casual usage doesn't belong in a definition.

As an example of the difference, a college professor who neglects giving credit for ideas or a turn of phrase gets a jaundiced eye fom his collegues, one who plagerizes may loose his job.

Also, Marza said it succinctly with his "Ok?", but I need the slightly longer version:

<grumble> Having this node plunked down in the middle of PerlMonks Discussion, without any context, was a significant puzzle, at least for me. Parv gave me the essential link to figure out what was going on (Much thanks). With that I could figure out that I was wasting my time figuring it out. </grumble>

A brief comment at the end of the OP saying something like

(This definition was written for another thread, but is offered here for other's use.)

would have saved me much confusion.