"kbye" is a term used when angry and when wanting to end a conversation succinctly. A rather lame and abrupt way to indicate the cession of a conversation. dictionary definitions for Twitter language,Sms Speak,txt msgs, txt messages, texting, Text sms phrases, SMS lingo, Tweat, Txt messaging language Kbye has. the s-xiest person i know. It means ok bye then a smiley face.