A combination of the phrases "for real?" and "seriously?". The two joined together form "for-serious", adapted to "ferrserrious" meaning "are you really serious?"
Girl1: "Billy and Anna are like totally screwing in the bathroom right now!"
Girl2: "Holy Shit! Ferserious!?!"
Girl2: "Holy Shit! Ferserious!?!"
by Niki Williams August 17, 2003
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by mang July 11, 2003