Kappa

Kappa is an emoticon used on Twitch.tv. It is commonly used to express sarcasm, irony, puns, jokes, and trolling. The emoticon originated from a Justin.tv employee who created the emoticon using a picture of his own face. It is also the catchphrase, motto and spirit animal of community member Zesty. In Kappa, we trust. Kappa

History
The emoticon was originally created by a Justin.tv employee Josh, who uploaded his face as an emoticon, allegedly without permission. The emoticon quickly caught on and has since become the iconic face of Twitch.tv.

Usage
Kappa is commonly used to express sarcasm, irony, puns, jokes and trolling. The emoticon is usually used at the end of an ironic or sarcastic sentence. Sentences that contain a Kappa should not be taken seriously. As Josh, the creator of Kappa puts it, "The meme has become a sort of patron saint of light hearted trolling among the gaming community. Users typing Kappa into Twitch chat see a special emoticon featuring a smug looking human face."