An expression meant to elicit anger in someone, or express self-satisfaction after having successfully trolled them.
Usually portrayed as half-closed eyes and a smugsmirk or open smile, giving the impression that the person is annoyingly gloating over you, much to your irritation.
For the Rage Comic character that the word "troll face" is nowadays associated with, see Trollface.
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.
