otay!, excl. — Green’s Dictionary of Slang

otay! excl.

[var. on OK! excl.; note J. Gibbons note (Apr. 2023): ‘[T]he expression was used passim in the ‘Our Gang’ series of movie shorts [later retitled ‘Little Rascals’] (1929-38)]

(US teen) fine! good! I agree!

1964		R.D. Abrahams Deep Down in the Jungle 239: She said, ‘Johnny, please can I have a ride in your wagon?’ So he said, ‘If I give you a ride in my wagon, will you give me some?’ She said, ‘Unh hunh.’ So he said, ‘O Tay’.
2000–02		Shona ‘Slave 4 U’ at Reader’s Corner 🌐 “Hi. Daddy…hiiiiii.” she chuckled. “Yes…yes. Otay. He want you.” She stood up straight, and held the phone to her ear.
2001		N. Tep posting on Elfwood 16 Nov. 🌐 oh yes! otay, specially fer u, and terra of course, me get up the sequel.