(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.
A trigger on a gun that is adjusted so far so that it would go off with barely any trigger presure. Making the weapon highly dangerous and more likely to go off by accident and shoot or kill someone
Chad: Did you hear about the guy that got shot last night?
Hank: Yea it was an accident. The guy had a nigger trigger on his gun
The button that triggers an alarm on a bus or taxicab when the driver is in fear of being robbed or assaulted, the alarm notifies the police that the driver is in distress.
A special button on a Polaroid camera used for company ID photos that you push when youtake a picture of a dark person so that the lens will adjust and will enable a clear image.