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1.
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!?!"
by Niki Williams August 16, 2003
 
2.
to wen someone is wants to know if it's ferrell or serrious but cant make up dem minds
"are yooh ferrserrious??"
by Scar May 01, 2003
 
3.
a mixture of the words ferrell and serrious..
yo homes r yooh ferrserrious??
by mang July 11, 2003