shortened version of "i dunno", which is a shortend version of "i dont know", which is a shortend version of "i do not know"

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

Basically the same thing as iunno, it is a quickened version of "I do not know", used in both chatting and in informal speech.

It's history may trace back to Homer Simpson, who often makes a sound that is in between "iono" and "iunno". (Says a lot about his intelligence, doesn't it?)

12 year-old internet chatter's way of saying "I don't know."

retarded way of spelling i don't know

Slang for "I don't know"

This is the slang version of the phrase, "I don't know?"