An expression meant to elicit the same raging anger that its namesake activity causes. Usually portrayed as semicircular eyes (upper half exposed) and a smirk or open smile, giving the impression that the person is almost goofily gloating about their victory over your sensibilities.
Similar to awesome face, but more assholish.
Not the same thing as doyagao, which is a look of smug self-satisfaction at something impressive that's been done. Troll face is more a sneer of schadenfreude at something that's been done to another person.