A male who prefers to express himself in the form of fecal matter.
Some tell tale signs of a Shitboy are rank room-clearing farts and publicly dislodging excrement through the anus. Shitboys attend social gatherings strictly to disrespect the host's nostrils and overall well-being.
Ya know, that child movie character whose a brat, usually messy, always up to no good. I mean, I don't need to elaborate further it's a disgusting little shitboy.
A: Did you see that new Final Destination movie that came out?
B: Yeah.
A: That kid from the opening scene who stole pennies and threw one and caused that entire skyview disaster, I hate him.
B: Yeah me too, he's a disgusting little shitboy if you ask me.
Pronounced "Sh-ite-boy" A degenerate guy who sticks up for a girl he barely knows online. Usually on xbox live, twitter or facebook. Most times the guy has never even met the girl before, and jumps at any chance that he can come to the rescue and gain her respect/trust.