ワイ・ツー・ケー Ｙ２Ｋ LinksSentence search for Ｙ２ＫSentence search for ワイ・ツー・ケーEdit in JMdict Noun1. Y2K (bug); year 2000 problemComputing, See also ２０００年問題Noun2. the year 2000; the 2000s Discussions Log in to talk about this word.