Same meaning as "dunno", which comes from "don't know", except it's shorter and easier to type when IMing
Guy: what time is the party at josh's house?
Girl: i unno, go ask stephanie
by krystal_kiss February 16, 2006
Unno is the latest in a long line of Proper English words unwillingfully sodomised so that they are fit for internet consumption.
jayseven: Unno watya onboot teh dud!
jayseven's dad: I don't know what you're on about, son!
by jayseven July 28, 2004

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