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A teenager who emits an aura of obnoxiousness. Also typically picks fights and looses and always talks back to people of authority. Looks like a rodent.
I actually hate that ratboi in 3rd period. He's so stupid
Ratboi by Boitho October 8, 2017
Related Words
A ratboi is a type of player in Rainbow Six: Siege who will purposely choose recruit and use the M870 as their primary weapon. Ratboi can be used as a noun, and as an adjective.
I’m going ratboi this round guys.

Get ratboid you bitch-ass nigga.

FFFUUUUUUUCKK A FUCKING NAKED RATBOI, WEARING A SANTA HAT KILLED ME WITH A CANDY CANE AHHHH!!!!!
Ratboi by Soap O’Dope June 13, 2018

Ramboistrous 

When one is being too rowdy and loud to be classified as rambunctious or boisterous.
The men were being ramboistrous when they watched sports on the T.V.
Ramboistrous by Senojim May 16, 2010
Usually found in online games, especially cooperative ones. When some little 11 year old faggot thinks it's another episode of some gay anime show or something, and goes out to be a LONE MERCENARY FAGGOT but ends up getting fucked up when he leaves his group, because the sole purpose of the group was to work together to kill monsters that they couldn't normally kill anyway. People like this usually never learn, because ramboism is usually a cause of impatience. The term derives from Rambo, who was the stereotypical lone badass.
SSJ4Gogeta666 suffered from a bad case of Ramboism when his Warrior went off by himself to attack some level 26 monsters in his group that he could never kill anyway because he was level 20.
ramboism by Arch0wl December 11, 2006
Did you see that guy on CNBC?

Man he went full rabois - don't think he comes back from there
Rabois by AndyFastow September 23, 2022
He really don’t care at the moment bruh feeling ramboish asf rn
Ramboish by Commando Rambo January 18, 2023