A yellow smiley face appearing to shake from side to side or vibrate, generally depicted with its mouth wide open and blurred or distorted facial features. Most platforms include curved motion lines around the face to indicate rapid movement.

The design draws on the comic book and cartoon trope of a shaking face. It can be used to express shaking from external forces, such as earthquakes, loud noises, or dinosaurs walking nearby. It can also be used to express shaking caused by strong emotions, such as shock, fear, confusion, disbelief, anticipation, and excitement. Additionally, it can represent dizziness, double-takes, or double vision.