What does “pull leg” mean?

to play a joke on sb, usually by making them believe sth that is not true

How is “pull leg” used?

In Requiem for a Dream (2000), one line is: “Come on, Ma. Who's pulling your leg?”

The clip at the top of this page is from Requiem for a Dream (2000).

Come on, Ma. Who's pulling your leg?

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