vibe check

Meaning

1. An informal check on someone’s mood or attitude, or on a place’s overall atmosphere.
2. A moment where someone’s behavior gets judged as acceptable or not.

“He walked in complaining already. Failed the vibe check.”

Where it came from

The phrase builds on the older word vibe, itself short for vibration, used since the 1960s for a feeling or atmosphere. It became its own meme format on Twitter and TikTok around 2019, often used to call out someone’s bad mood on sight.