What does it mean when someone calls you a Tryhard?

a person who participates in a game or other activity with too much enthusiasm, emotion, effort, or commitment : These tryhards need to take a moment, take a breath, and chill out.

It’s a bad thing because the person is usually either insincere or lazy or completely clueless. An example of a ‘try hard’ would be someone who was brand new to a group and, instead of making an effort to get to know people, would maybe buy everyone an expensive gift to make them like him/her.