When a person wears a face mask or face covering covering below their nose and mouth, rendering them positively useless. Plague Bibs are generally seen on people who are skirt a mask regulation, but also worn for those who want to have their mask handy to pull up when someone approaches. Synonym: "chin diaper" which was coined on"South Park" Season 24, Ep 1 "The Pandemic Special
"Both the cashier and the guy behind me in the checkout both were wearing plague bibs. I am so going to die."
"That lady, Karen, she raised a fuss about wearing a mask and stomped out. She came back in with one on, but plague bib style.
"I"m just going to wear my mask like a plague bib when I go to the park, if anyone comes nearby, I can just pull it up. "