The first one would be the most accurate, but instead of a real mental condition tied to a horrible event in ones past, these fat fucks usually just stuff their faces more. Triggering content could also be a warning to people who went through some horrible event in their life that caused lasting psychological issues. Rape, beatings, suicide, etc topics in videos or pictures can "trigger" people and remind them of that thing in the past and kinda make them relive it. I've had friends who were triggered by words like rape or beating and you can usually see what it dose to them. It is not as bad as PTSD but it will certainly kill their mood/vibe or make them cry. Fat fucks use it to try to push pro-fat speech by making you censor yourself or your body because it "triggers" their "eating disorder", when in reality they are just pathetic