1. An individual having proposterous amounts of self belief as a result of completing a degree, irrespective of the quality of the degree and the institution that provided it, and convincing themselves that their lacklustre first job in the industry as being more significant than it is. The dog knob is also apparently devoid of any skills normally acquired from a degree or is certainly unable to apply them to their job.
2. The penis of a dog
"What a dog knob, he reckons building PCs is such a high powered job. I bet it took him all his degree to learn that!"