A warning often found on blogs to warn people who could have panic attacks or other extremely negative reactions to words or situations that these "triggers" will be mentioned in the text/video/alternate form of media. This is meant to prevent said person/people from becoming upset due to PTSD or other mental disorders.

A common misconception is that triggers are just made up for oversensitive and stupid people and should not be taken seriously or even mocked. However, this is disrespectful and mocking mental disorders and their sypmtoms is extremely rude and a terrible thing to do.

A trigger warning is when something may make you feel emotional, like mad and upset
So at the start of a text, video, etc it my say 'trigger warning', it alerts the viewer that the content may make them feel ashamed, have a break down, etc.
the moral is that if you see trigger warning, just be prepared that your emotions may escape your mind :)

A cop-out that social justice warriors use to make it seem like they're accomodating people with PTSD. Trigger warnings are usually posted at the content's header in order to keep from acknowledging that PTSD episodes do not stop for anything so long as the "triggering" content is still there and thus avoid responsible conversations about trauma.

A cocktail based on the non-alcoholic drink called a Roy Rogers. The drink consist of the classic Roy Rogers mix of cola, grenadine and a cherry. However, it is served with a chaser of high-grade horse tranquilizer.

Two words that are sometimes used by concerned authors to alert that some parts of a shared article or video could cause post-traumatic flashbacks to some readers. Never used by rapist when they're talking about rape, because, you know, rape is no big deal and raped women don't have to be oversensitive.