UK slang.

A young teenage criminal. Lives in the airconditioning ducts of highrise blocks and shits on the carpets of the people he burgles
My TV's gone and there's shit on my carpet, I've had a rat boy in here.
by black flag June 02, 2004
1.Person, usually male characterised with ugly features, usually sqinty eyes, buck-teeth and large appendages. Mostly avoids light, coming only out of his swamp at night to feed on scraps and discarded food. Favours dark rooms and corners, frequently listens to depressing goth music or metal. Rarely seen during daylight or showering. Generally unclean. 2.Dirty person. 3.Insult, usually directed to males or masculine females.
1.My sisters boyfriend is a goth, I dont know why she hangs around with that ratboy. 2.Have a shower ratboy! 3.Fuck off ratboy!
by John Barry November 20, 2004
A breed of vermin which is half rat half boy. They are extremly rare in the u.k, but can be spotted in Tregaron in Wales scurrying around for nutts. The welsh translation for rat boy is DAFYDD.
"Have you seen dafydd" "you mean rat boy!"
by Shrew Kid November 06, 2007
an ugly person that no one like but is alway there. has little friends.
That Chris Hawk is a Ratboy
by F3arday April 24, 2009
A very young person that dedicates his life at playing online games. They are usually of ages between 4 and 12, with an obvious lack of life experience, and annoying voices characterized for its very high pitch.

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.
Player 1: Hey man, stop dying.
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*
by Nacsotron August 29, 2014
Rat-boy is a neglected child who decided to live in the sewers with the rats, the only ones who would accept him. He lives today to put fear in children as he raises his army of rat soldiers and mice minions! He also creeps kids out by talking to people in the shower like that weird clown in the movie "It", freeky shit man i pissed my pants, i hate clowns. Anyway, be prepared for the uprise of ratboy! (and clowns) Lock and load your guns, get your tangelows, whatever you need for the end! -P.S. Clows really hate tangelows.
RAT-BOY is half rat and half boy.... like a boss....
by dickholelarry June 14, 2010
A young biped homosapien with a rather rat shaped skull and rat fingers and other rat like limbs.

Body phyisique of a rather wide upside-down wineglass full of ejaculatory fluids.

Body odour is similar to that of a misture of diseased rattus norvegicus carcass & 30 dead skunk baby's, bathing in a 40 gallon titanium container of liquified ammonia with a hint of sulphurique acide and nuclear waste.
Rat Boy: Hey girls's wanna come chill at my crib?

girl 1: Where do you live at?

Rat Boy: In a mansion made of dried up, used toilet paper and i use contaminated hospital syringes for nails to hold 'er all together!

girl 2: *gag* wow, your one dirty little boy *winkwink*

girl 3: what do you sleep on?

Rat Boy: A very comfortable matress made by me and my friends, made of used condoms and baby diapers. All held together by my very own ejaculation glue.

girl 1: EWWWWWWW ! Your one of those *gag* RAT BOYS!!!!!! *gag* *vomit*

girl 2: *glass shattering shriek* *upchuck*
girl 3: *vomit on girl 1* *takes out pepper spray and sprays girl 2 by accident*


Rat Boy: Mmmmmmm this is gettin kinky. *chews their hair and runs away*
by Rat Man Sensei April 15, 2009

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