Pull somebody's leg - Idioms by The Free Dictionary
pull somebody's leg
pull (one's) leg
To tease or joke with someone, often by trying to convince him or her of something untrue. Quit pulling my leg, I know there isn't a Hollywood director calling me right now. I love pulling my sister's leg—it's almost too easy to annoy her.
pull somebody’s ˈleg (informal) tell somebody something which is not true, as a joke: ‘You came first! You’ve won the prize!’ ‘Really? Or are you just pulling my leg?’ ▶ ˈleg-pulling noun: The news of his engagement was greeted with much leg-pulling by his friends.