It symbolizes a 'what goes around, comes around' situation, where the consequences of your actions return to you. It's useful for emphasizing cause and effect, whether positive or negative.

While it originated as a hunting tool for Indigenous Australians, it's now more widely used to describe the 'boomerang effect,' where an action has an unintended, opposite result. It's also used to critically express a situation where a past remark on social media comes back to haunt someone.