What is get your panties in a bunch meaning?

"Get your panties in a bunch" is a phrase used to describe someone who is overly upset or angry about a situation that is not worth getting upset about. The phrase originated in the United States and is considered a colloquialism. It implies that the person is overreacting to a situation, and the reference to "panties" adds a sense of triviality or pettiness to the situation. The phrase is often used in a dismissive or mocking tone, and can also be considered offensive or inappropriate in certain contexts.