Half-Orc

A half-orc is exactly what it says on the tin - an unholy fusion of man and orc, hopefully brought about by an male orc raping (or, if the native women are amicable, tender lovemaking) a female rather than a male human having sex with a female orc (female orcs are very ugly and unfappable, if you go by Blizzard standards). Typically they get small (+2) bonuses to physical stats (STR in 3.5e) and a small (-2) penalty to mental stats (INT and CHA in 3.5e) and tend to lean towards evil and chaos in settings where orcs just swing that way for reasons of giving PCs critters to kill without feeling bad about it.

Basically, if you want to play a big, dumb, "I hit it with my axe" pure combat class, especially a barbarian, half-orc is the race for you. Though in 4e, they make pretty good monks.

Neverwinter Nights seems to go out of its way to show us half-orcs who subvert the big dumb somewhat savage brute stereotype by actually being rather intelligent and/or honorable. In fact, you may not even meet a half-orc who was actually dumb in Neverwinter Nights. Furthermore, Daelan Red-Tiger is the most badass Half-Orc ever, due to being voiced by Steve Blum.

They are fuel for angst since neither Humans (who think they're ugly, dumb, and savage) nor orcs (who think they're impure pussies since they don't get +4 strength) like them. Even the faggoty elves (who don't like orcs and thus don't like half-orcs), derpy gnomes (who don't like orcs even more) or manly dwarves (who hate orcs like their neckbeard kin hate Matt Ward) won't trust them. Hell, even mind flayers dislike them because typically their low mental scores means that their brains taste like shit to them and since they don't get +4 strength like full orcs they are not good for dumb muscle. Besides, mind flayers already have Umber Hulks for that.