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
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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!
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A phrase most frequently used over the internet. This is a polite way of saying " I don't wanna do what you wanna do , so fuck off . "
" Dude, wanna come over? "
" I unno man "
" .. "
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