ResidentSleeper is a Twitch emote used to express boredom, tiredness, or that something happening on stream is dull or uninteresting. It is often spammed in chat when viewers feel that the content has slowed down or become monotonous.
Origin
The emote features the face of streamer Oddler (real name: OddlerPro) sleeping. The image was taken from a livestream in 2012 during a 72-hour gaming marathon of the game Resident Evil, where OddlerPro fell asleep on stream. The emote was later uploaded to Twitch and became widely used as a symbol for boring or sleep-inducing moments.
When to use
When a streamer is taking too long to do something or is AFK (away from keyboard).
During slow or uneventful parts of a game or stream.
When chat wants to jokingly tease the streamer for being boring.