- reaction meaning
- Used in comments to indicate that a post, video, or person described therein is dangerous, toxic, or harmful — often in community warning posts.
- comment use
- Placed in comments to warn others about scams, toxic groups, dangerous misinformation, or genuinely hazardous information being spread.
- boomer interpretation
- Often taken more literally — older users may use it only in contexts related to actual biological or chemical dangers, environmental concerns, or COVID-era content.
- group use
- Used in health, science, or news groups to tag posts about disease outbreaks, contamination alerts, or genuinely hazardous biological events.