Grubnubber
A person who exploits a situation for personal gain, i.e. the person who glues your hard work onto a poster and claims that they did half the work of the project.
Andrea: Hey, did you hear about how those kids in Another Brick in the Wall part 2 didn't get paid?
Louisa: Yeah, Pink Floyd is such a Grubnubber!
Louisa: Yeah, Pink Floyd is such a Grubnubber!