(n.) Someone who triggers on you or the person to an extremely high extent, causing extreme anger. Usually initiated to someone of the black skin colour.
You sir, are a trigger nigger, and cannot be forgiven for your roasts regarding underage memes.
when a bearded guy fingers a girl in the ass, doesn't wash his hands, and introduces himself to another girl later in the day, shaking her hand while feeling up her wrist with his defiled trigger finger.