To deceive someone in a humorous or playful way.
‘You’re pulling my leg’ was a common slang expressions in the 20th century, but is rather going out of use these days. It would be nice to be able to say that I’ve discovered the origin of ‘pulling your leg’, which is one of the holy grails of etymology. Regretfully, not. Nevertheless, I get asked about the phrase often and it’s worth investigating, so here goes.