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1.
The degree to which a piece of internet content has been or might be shared in a short amount of time. First coined by CollegeHumor co-founder Ricky Van Veen.
Research into influence and virality suggest that finding swayable audiences is far more important when it comes to spreading information than the apparent influence quotient of the person passing it on.
by quaar November 30, 2010
 
2.
The level of which a service, site, post, or anything related to the internets is viral. Increased levels equate to increases of Web 2.0 manliness.
If DiDGU's going to be the 800lb gorilla that tears through the competitors like so many pieces of wet tissue paper, we're gonna need more virality on the site.
by chad@didgu January 16, 2007