Iuno 

Iuno is I don't Know, but One word :)

23:33 <Donkie747> What you guys doing
23:34 <Dash`> rofl
23:35 <Donkie747> rofl?
23:36 * Q sets mode: +o Gen|Work
23:36 <Dash`> iuno

Iuno by Ash October 13, 2004

iuno 

Onomatopoetic for "I don't know"

Person 1: What should we eat tonight?
Person 2: Iuno, whatever you want bae.

iuno by Stephen4241 September 3, 2016

Iunoh 

Shorthand version of the phrase, "I don't know." Best read imagining the author shrugging the shoulders and mumbling "iunoh"

Guy1: "what are we doin' tonight?"
Guy2: "iunoh, but imuna get smashed"

Iunoh by NoUse4AName July 11, 2007

Iunoo 

That noise you make when you say “I don’t know” quietly but quickly.

Bill - “Hey Jeff where did you put my banana?”
Jeff - “iunoo”

Iunoo by FunSizedPopcorn October 11, 2018