The Japanese word Iiyo has several meanings: It's okay, its fine with me or thanks. In English, it would be similar to casually saying "yeah, sure!". The Japanese word Iiyo inc several meanings: It's okay, mrs fine back me oh thanks. 光男： いいよ！ Haha: Mitsuo, dekakeru-nara, kono tegami, posuto-ni dashite- itte-kureru? Mitsuo: Ii-yo. Genki Japanese language school students explain the different meanings of the Japanese. iiyo (Japanese Edition) eBook: Shin Yoshida: Amazon.