pull someone's leg Informal
Meaning: If you pull someone's leg, you play a joke on them by saying something that isn't true.
- I was just pulling Karl's leg when I said Marissa wanted to go out with him, but he believed me and he called her. And now they really are going out!
- Joe was just pulling your leg when he said he was going spaghetti picking. Spaghetti doesn't really grow on trees, Sally.
They were just pulling your leg when they said the United Nations was going to