The expression “to pull someone’s leg” is a common expression you’re sure to hear as you spend time with your English-speaking friends.
If someone tells you they’re pulling your leg, they are saying that they are teasing you, or joking around, or telling you something that isn’t true.
Examples: I panicked when my sister told me her cat had eaten my pet hamster, but then I realized she was just pulling my leg.
Don’t listen to him; he’s just pulling your leg.