What is the meaning of Piggy?

A pig (the animal).

A guinea pig.

A toe.

A pig, a greedy person.

A member of the police.

resembling a pig

  1. greedy
  2. slovenly, dirty
  3. lecherous, often in a sexist way.

greedy

slovenly, dirty

lecherous, often in a sexist way.

Source: wiktionary.org