Noun. The guy who doesn't shut up about what he got on that quiz, or sets out after an exam to compare grades with others, usually because he knows he did extremely well. motivations include the desire to brag, or the desire to make others feel bad about their own grades.
Them: What did you get on #14? I put C, so I know for sure I got ONE wrong. This is going to bring my exam average down to a 97%.
You: Fuck off, grade grubbers. No one cares