Region: UK | Usage example: He claimed his laptop burned the toast, but he was pulling my leg.

Pulling your leg

Meaning

Joking or teasing playfully.

Used when the listener can tell someone is kidding.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Old prank involved tugging someone's leg to trip them lightly.

Victorian humor magazines described pulling legs as harmless fun.