Top Definition
It is derived from: "I do not know"
It was changed to: "I don't know"
Then: "I Dunno"
Finally: "Iunno"
"When did that happen!?"
"Uh.... Iunno."
by Kavkid June 02, 2006
"I dont know", but really fast.
Usually AIM slang.
lkdsf0990 : "what did you do today?"

kjdsfh900: "iunno."
by doodooheadnicole October 08, 2005
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 "

" .. "
by deanispenis November 10, 2009
a word used in conversation when the person is severly bored and uninterested in the current discussion. usually used by those who are lazy and fatigued.
Tim: dude, what topic are you choosing for your english essay?
Jack: iunno
Tim: dont you have any ideas at all?
Jack: iunno!!
by ribeco !! June 10, 2008
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