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1) Means "I don't know". Contrary to popular belief, does not mean "Keep asking me the same question and maybe an answer will pop up."
1) Her "What turns you on about bondage?"
Me "I dunno"
Her "Is it being tied down or having no control or having to place your trust in someone?"
Me "I don't know you stupid bitch! Stop asking the damn question!"
i dunno by OogaBooga October 26, 2004

yeah nah I dunno 

Yeah = yes a) I understand the question, b) it was me, c) i might agree with what you are saying. Nah = No a) I don't think thats right, b) it was not me, c) there is no useful information i can give you, d)come to think of it, maybe i don't agree with you. I dunno = I'd like to put in a disclaimer and nullify anything I just said. Non committal. Common in Australia.
Did you use my toothbrush?
Yeah nah I dunno.

Is it going to be a nice day today?
Yeah nah I dunno.

Do you want a shag?
Yeah nah I dunno.
yeah nah I dunno by Bogfrog September 8, 2007

i dunno, lol 

¯\(°_o)/¯

Also written as: I dunno lol, Idunnolulz, dunnolulz
"What does it feel like to hold a woman in your arms?"
"I dunno, lol."
"Huh?"
"¯\(°_o)/¯"
i dunno, lol by blazelust February 16, 2008
Slang for I don't know.
I dunno what movie we're watching tonight.
i dunno by fphate August 6, 2004
what people say when they don't feel like saying i don't know

Can also be said to be annoying
"hey do you want to go to the movies?"

"i dunno"
i dunno by i'm hungry! August 28, 2007
How lazy people say "I don't know.".
Mom: What do you want to eat?
Kid: I dunno.
I Dunno by Bananaramamamama October 31, 2009