yyjSmile is a Twitch emote featuring a close-up of a smiling face, often used to convey a sense of friendliness, positivity, or sometimes a slightly awkward or forced smile depending on the context. The exaggerated smile can also be interpreted as sarcastic or ironic, depending on the conversation.
The yyjSmile emote originates from the Korean Twitch community, specifically from the streamer yyj (유영진). It began appearing in Twitch chats around 2018. The emote is based on a photo of the streamer, and it became popular within Korean Twitch circles before spreading to other communities through global emote extensions like BTTV and FrankerFaceZ.