The act in which an individual is angered or upset at a specific subject.It is usually used ironically. It is basically another word for the word angry but a more ironic way of saying it.
Bro, Buzz feed triggered me with that video, i'm so angry.
Used almost exclusively as a way for angry right-wingers to show their offence by the content of a post without having to actually explain why they have a problem with it or defend their point like an adult, thereby protecting their fragile ego and assuring themselves that they're better than everyone else.
"I can't believe they actually elected a president who thinks global warming is a hoax."