Most important, they are always spoiled assholes and always act aggressively towards other players, specially older ones. If they feel somehow threatened they will immediately insult you. Nevertheless, if you respond in the same manner, they will run and/or cry and tell their parents (just like a rat).
The most known ratboy nests are Minecraft and League of Legends.
Ratboy (annoying voice): shaddap you cun mu'faka piece of crap shit whore!
Player 1: You are a ratboy! I will find you and I will kill you and your family for having raised such a waste of energy.
Ratboy (sobbying): Mommy! Daddy! The man was rude! *squeak* *squeak*
Matt: No the bastard just gunned all the vod and left...
Steven: Well who's going to pay the bar bill?
Matt: Good job I have his I Phone 4 for colateral.
Steven: Ah all is well then, shall we indulge in another bottle of Grey Goose?
Matt: Indeedyo, we shall chunder like it's the end of 1999.
A hybrid of the black rat (Rattus rattus) and some semblance of a human being, RatBoy gains his name through his ability to scurry up any old drain pipe with vigour, voluntariness and without remorse. RatBoy is a rare bread but yet distinctive if sighted in its natural habitat - namely dark corners of bars, clubs and supermarkets. A small beady, yet twinkle eyed creature that can sniff out its prey from vast distances. A smooth talker and schmoozer who's had the cognitive or emotional experience of guilt bred out of them.
Friend: "What a RatBoy!!"
Tyrell: Not bad man, it looks a bit thin but.
Matt ('Ratboy'):Thin like the ice your ass is on, why don't you make it a bit thicker like David's head.