i.o.u. meaning:[American slang] adj. phr. I owe you, abbreviated; a promissory note. I had to borrow some money from John and, in order to remind both of us, I wrote him an I.O.U. note for $250. i.o.u. artinya:surat pengakuan hutangi.o.u. перевод:долговая расписка Письменное подтверждение [borrower's note] должником наличия долга. Выдается кредитору (От "I Owe You" = "Я тебе должен")