look up any word, like wyd:
A form of viral marketing which originates and grows across multiple networks simultaneously.

Multi-viral growth is more powerful than traditional viral growth because each of the propagators spreads the content to multiple social networks simultaneously.
PlayOnSocial lets developers grow their user bases multi-virally by allowing them to connect to Facebook, MySpace, Twitter, Gmail, Yahoo, Aim, etc.

iPad application "SchoolPad Notes" used PlayOnSocial to spread multi-virally across the iPad market. In 20 hours the multi viral growth had catapulted the iPad application to the #1 most downloaded position. This event was monumental for multi-viral growth as the application was the first app to over take Apple's free first party iBooks application.
by theJustinLewis October 18, 2010