An immature, naïve or inexperienced person.
A young bird which has just developed its flight feathers (notably wings).
An insect that has just fledged, i.e. undergone its final moult to become an adult or imago.
Emergent or rising.
Untried or inexperienced.
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.