An upstart or newcomer; nouveau riche; parvenu; an ambitious, brash or arrogant person who has yet to integrate with his or her new social group.
A person usually of little talent who tries hard to succeed, especially through imitation, usually to gain fame or popularity.
A person who is perceived as putting too much effort into something recreational, such as a game.
To put perhaps too much effort into a recreational activity, typically a game.