When to Use
- When someone sends a pic that is way too thirsty for the group chat.
- When you see the absolute state of a text thread after someone gets exposed.
- When you witness some degenerate behavior that has you staring in total disbelief.

Source: Tom and Jerry
Jerry the mouse stares at something in absolute shock, his jaw elongated and hanging down all the way to the floor in disbelief.
Used as a reaction to express extreme shock, disbelief, or being utterly speechless at something ridiculous, disgusting, or mind-blowing.