During the summer months, middle-aged Chinese men roll up their shirts or t-shirts all over China, creating a sort of bikini as they are revealing their abdominal area and lower back. Thus the glorious, aptly named: chinkini.
It can look even more amusing when chinkini-wearing Chinese men are drunk on bai jiu and/or swearing at the high temperature.

When you eat dirt for the first time and leave your family to build a shack in the woods

A Chinkini is a surgical mask not worn correctly during the Covid-19 pandemic.

The person wearing the mask has a mask on but instead of the mask covering their airways, nose and mouth and protecting them fully they have instead opted to wear a mask that they have pulled down onto their chin offering them absolutely no protection at all.