A emoticon used in Twitch.tv to show shock, disgust or surprise. It is usually used when the streamer does something really weird.
Streamer: *inaudible noises that resemble a monkey*
Twitch chat: WutFace
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an emote from Twitch.tv , used by chat when something weird , uneasy or eccentric happen during streaming
*suddenly , streamer start to scream out loud and crawling around his/her room*
chat : WutFace he went nuts , someone stop him WutFace