The state of keeping one's own nerdom hidden from others, including friends, family and coworkers. Often used to cover a deep-seated nerdom to appear normal to others. One can usually attain this state by withholding certain aspects of, or strong touches to, their own personality, or by keeping slightly at a distance. Keeping this up is made easier by not revealing many nerdy facts about onself.
"Jared's still incognerdo with his girlfriend. He still hasn't told her that he loves anime. One sniff of that kind of information and she'll be onto him, and know just how big of a dork he is."