Always Chaotic Evil
Always Chaotic Evil is a slang term that /tg/ has picked up from our frenemies over on TVTropes. The term originates from Dungeons & Dragons, and specifically its early use of the mechanics of alignment. In the Monster Manual, creatures would always have their "alignment propensity", the specific alignment that the "average" member of their species would have, listed as part of their statblock.
It's mostly used as an easy placeholder term for the "typically villainous races" - orcs, goblinoids, gnolls, ogres, etc. A handy way to refer to the usual "chuck 'em at the PCs and let them hack 'em down" cannon fodder races.
The term has gotten a little unwelcome on /tg/ in modern years, as the basic idea that thinking humanoid races are somehow inherently evil and deserve only extermination is seen as being... well, a little too /pol/-friendly. That and what's the point of roleplaying if you can't go against type (meaningfully, mind you)?