Term used to describe a person who wrongfully believes they are a bad ass. This type of person typically tries to make a dramatic stand for something they see as important, when - in actuality - either no one gives a crap, or they painfully botch the attempt. A nerdy harry cannot be taken seriously on any level. There is NO cost in ignoring them completely.
Greg was really passionate about this new comedy series he discovered. I realized he was a major nerdy harry when he showed me his 'amazing find' was actually a British sci-fi space comedy that has already been yanked from production due to its incredible - though not unforseen - level of SUCK.