Any combination of airborne or suface-borne illnesses, contracted by the sharing of handheld electronic devices, D&D dice, cards or videogame controllers between various geeks of questionable hygiene. (Also See 'Geek Crud')
Did you hear that 10,000 people came down with the Nerd Flu after that gaming convention last week?
by Lexicon Grrl September 28, 2010
Absence from school/work the day after an all nighter/ midnight showing of a blockbuster film (usually based on a grapic novel such as Watchmen).
"I came down with a bad case of Nerd Flu after the midnight showing of X-Men Origins: Wolverine on Thursday."
by Sourr Elizabeth April 30, 2009