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2 definitions by Mallio

 
1.
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?)
PersonMan: So, whatchu up to tonight?
TriangleMan: iono. How bout j00?
PersonMan: iono.
TriangleMan: das coo.
by Mallio November 19, 2003
 
2.
one syllable, similar to "ism"

basically "yes", originally a shortening of "yes ma'am" but gradually becoming used in almost all contexts in which yes is used.
"Hey you there?"
"Yesm"
by Mallio June 09, 2003