A silly or idiotic person. Originally coined by Lucy Dalton to describe her younger brother Harry. It had since become a common part of the Australianvernacular.
An aneurism caused by excessive fanboy/girling caused by nerdy objects. Symptoms include: loud exclamations, frothing at the mouth, excessive gasping, fainting, an instant drop in perceived coolness, and senseless, unintelligible babble.
Nick had a nerdeurism the other day over the new left 4 dead expansion that was coming out. It was embarrassing..." "Really?Geez what a nerd."
People who are spending a lot of time on skype, doing stupid things like singing never say never from Fievel, playing sea battle or hangman, or doing some musical quizz too.
My brother telling me he was "questing in a Massively Multiplayer Online environment when my avatar was booted by mods for camping" caused me to have a nerdeurysm.