In online communication, it's used to mean a firm refusal, like 'No more!' You can use it to strongly oppose someone's opinion or to forbid a certain topic.

This emoji can imply more than simple opposition, even suggesting the severing of a relationship. It's used on social media to announce that you've blocked someone or to make a strong declaration like, 'I will never tolerate this kind of argument.' It's an interesting case where the 'ejection' rule from sports has been extended to mean 'blocking' or 'cutting ties' in the digital world.