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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
9 7
Slang for "I don't know"

Ionno what that biach is talking about.
by ookiemonster April 20, 2003
53 13
Slang for "i don't know" ... used mostly by geeks.
ionno wtf ur talkin bout
by ionno May 26, 2003
14 33