1. A term used to describe sensations, images, or experiences that trigger a traumatic memory. Related to Post-Traumatic Stress Disorder.

A strong emotional reaction set off by a set of words or image that reminds a person of a traumatic event. Used often in the Self Injury community to describe something that may cause a person to relapse into a cutting, bullimic, or other self injuring state.

Triggerism is a condition In which you tend to get triggered a lot, you can also use it to insult other people or make fun of them.

A person who is ill tempered and or get's angry easily.

A topic, phrase or word that emotionally sets someone off. Could refer to anger, or reliving a traumatic experience. Sometimes this is logical, other times it seems like an attention grab. It is fairly common for certain communities on, for example, Livejournal to be overly sensitive to people's 'triggers' (often but not always relating to sexual assault)--any mention of violence may be censored.

A word used often by idiots on Tumblr to justify their bitchy attitudes, most of whom don't know what a real traumatic experience is.