OK, adj. /oʊkeɪ/
A word with murky history and many possible origins. Most likely comes as imported WWII slang (see also “skosh”) from Japanese 了解, ostensibly pronounced ryokai and meaning “Roger” (or any number of military confirmation signals). However, in Japan’s affected hypermale accent – commonly used by soldiers and the like – the pronunciation is something more like /joʊkeɪ/.