Kappa

From English kappa, borrowed from Japanese 河童 (kappa, “water imp”). Included as an Easter Egg by an early Twitch employee.

Kappa (plural Kappas)

1. (Twitch-speak) An emote, often used as a postscript, to indicate that the preceding statement is sarcastic or false.

Kappa

1. (Internet) Used to indicate sarcasm in imitation of Kappa as used on Twitch.tv

• David Goldenberg (2015 October 21) “How Kappa Became The Face Of Twitch”, in FiveThirtyEight‎^[1]
• Adam Newell (2017 July 7) “What does Kappa mean?”, in Dot Esports

 Kappa on German Wikipedia

Learned borrowing from Ancient Greek κάππα (káppa).

• Audio:

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Kappa n (strong, genitive Kappas or Kappa, plural Kappas)

1. kappa (Greek letter)

• “Kappa” in Duden online