a person who participates in a game or other activity with too much enthusiasm, emotion, effort, or commitment. Most tryhards are toxic.

Someone who tries to hard to be cool/someone they're not.

someone who is trying so hard to achieve something that it's actually obvious that's all they've got

A tryhard is someone who tries far too hard to achieve at something or pays a pointless amount of attention to every minute detail of it to ensure perfection. It's also an insult levied against high-achievers by lazy people. Both the noun and verb form are frequently used in academic and work environments, as well as in video games. When it's used by gamers it generally means "someone who plays far too much," and it's generally used by hardcore noobs to justify the fact that they just got pwned.

It can also be used as a verb to describe putting a lot of effort into something and fretting over the minor details of it.

someone who puts posters on the bedroom wall of bands like green day and simple plan, and don't even listen to but still pretend they do so they can look "cool", but in reality they're a tryhard

person who overexercise does something because other people are around

Word used to describe people that lack talent but give it 110 % in everything, esp. sports; people who get very intense in what what they are doing.