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1.
Slang for "I don't know"

Ionno what that biach is talking about.
by ookiemonster April 20, 2003
 
2.
DEFINITION-i don't know.
usually said when shrugging their shoulders and lying
Mom- Thomas James Anderson! Whose bong is this?
TJ- ionno..
Mom- Don't you lie to me!
TJ- I'm not...ionno
by VICKYflysHIGH February 15, 2009
 
3.
Slang for "i don't know" ... used mostly by geeks.
ionno wtf ur talkin bout
by ionno May 26, 2003