Definitions by KE<3ET
Lip-back
A facial expression characterized by pulling the corners of the mouth back while slightly raising the cheeks, conveying feelings of discomfort, surprise, or sympathy akin to saying "oof" or "sheesh" silently. Often used in response to cringe-worthy situations or unexpected news.
"When James heard about the awkward thing he did at the party, he couldn't help but give a lip-back, silently feeling the cringe of the moment."