1. Agreement: It's used as a way to express agreement with a previous statement, usually a humorous or controversial one.
* Example:
* Person A: "I'm so tired of people who eat their cereal with milk."
* Person B: "What she said!"
2. "That's exactly what she said" (sarcastic): It's often used sarcastically to imply that the person speaking is actually trying to disagree with the previous statement, but is using a playful way to express it.
* Example:
* Person A: "I think the new Star Wars movie was amazing!"
* Person B: "What she said. (sarcastic tone)"
It's important to consider the context and tone of the conversation to understand which meaning is intended.