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When a nerd acts like something is common knowledge, but in actuality is not known to the majority of people.

It is a desperate desire to make clear that the nerd was fully aware of something, that you were not, and that he or she believes that everyone else was also aware of it.

Common examples of nerd brags include:

"What, you didn't know that?"

"Really? Oh weird, I know how to do that."
"Any time I can't figure something out on my computer, Steve has to nerd brag while he shows me how to do it."

"Ummm, you know that this security flaw has been know for almost a month now, right?"
by mxisaac March 05, 2014
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