An emotional/psychological reaction caused by something that somehow relates to an upsetting time or happening in someone's life. This reaction is often found to happen in war veterans, people suffering with PTSD, depression, and other mental disorders.
"Jim gets easily triggered."
"What a feminist."
"No, he's a war veteran who has flashbacks that effect him detrimentally when he hears fireworks or gun shots. Ignorant asshole."
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