Short for "I Owe you".

I couldn’t care less (but one must keep up appearances, right?)

A promise to pay a debt, especially a signed paper stating the specific amount owed and often bearing the letters IOU.

This is the abbreviation for I Owe You.

I Owe You

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.

written acknowledgement of a debt and a promise to pay it back(each letter pronounced seperately)