Ligma Balls

Okay, listen up, you silly goose. This is a 'knock knock' joke. Someone says 'Ligma,' which sounds like 'lick my.' Then, when you ask 'Ligma who?' the person finishes the joke with 'Ligma balls!' It's funny because they tricked you into saying 'lick my balls!' You probably laugh at farts too, don't you?