A promise to pay a debt, especially a signed paper stating the specific amount owed and often bearing the letters IOU.
Person 1: "How are you going to pay for this? You have no cash!"
Person 2: "It's okay, man! I'll just give him an IOU!"
by illEATurHARTout March 28, 2004
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Hey man, I am a little short on dough give me 5 bucks and I'll give you an IOU.
by gofishgo January 9, 2007
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truly stands for I Owe Unto.
as in i owe unto you this amount.
it is really just an expresion nowadays not really used because people as a whole cannot be trusted to pay debts ot just plain trusted. this is not urban but i saw someone else post this "word" and obviously hadnt a freakin clue what the true meaning is.
if you give me a burger today i would gladly pay for it on tuesday.

man get out of my burger shack. these times we livin in is inflated. pity dont pay no bills.
by who dat February 4, 2005
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written acknowledgement of a debt and a promise to pay it back(each letter pronounced seperately)
I had to give them an IOU to shut them up.
by The Return of Light Joker December 11, 2007
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IOU CAN ALSO MEAN. INSIDE OF YOU. THIS CAN RELATE TO SOMETHING BEGINOR IS A SEXUALLY DESIRE.
GIRL I WANT TO BE INSIDE OF YOU (IOU)
by HIKARI_UZUMAKIU December 2, 2016
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A silly scripting group that like to think they can damage virtual property.

My little sister could do this in her sleep. It's not impressive.
"Lets try and ask a staff member their passwords... OMGZZ I'm such a n00b!"
by IoU July 11, 2005
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