A child's word for a pig.
Miss Piggy is the flamboyant and demanding Muppet whose conviction of her own attractions is not always shared by her companions.
piggy bank a money box, especially one shaped like a pig; savings. In the past, children's piggy banks were often made of earthenware with a small slot for inserting coins, and had to be smashed in order to retrieve the savings.
See also pig, pigs.