Definition & Meaning of "[have] a cow"

What is the origin of the idiom "have a cow" and when to use it?

The exact origin of the phrase "have a cow" is uncertain, but it is believed to have emerged in the United States during the mid-20th century, particularly in the 1950s and 1960s. This expression is commonly used in casual conversations, humorous exchanges, and popular culture references. It can be used to highlight moments of frustration, surprise, or outrage, often in a playful or humorous manner.