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"Horse about" is an informal expression used in British English that means to play or fool around in a frivolous manner. It is often used in situations where people are not serious or pretending to be silly. For example, children might "horse about" with each other in the playground or friends might "horse about" at a party. It can also be used to describe someone who is being lazy or not taking a task seriously. However, it is not appropriate to use this phrase in formal or professional situations, as it is considered informal and somewhat rude.