The phrase “pulling someone’s leg” is an idiomatic expression that means to tease or joke with someone in a playful manner. It often involves telling someone something that is not true or exaggerating a situation, with the intention of making them believe it for a short time before revealing the truth. This expression is typically used in a lighthearted context and is not meant to be taken seriously.
For example, if someone tells a friend that they won a million dollars in a lottery but then laughs and says they were just joking, they are “pulling their leg.” The essence of the phrase is about playful deception rather than malicious intent.