Da nationality of Asian folks who practice da custom of respectfully "getting 50% down" --- i.e., bending your legs at da first joint, so dat you're halfway between standing and sitting on da ground.
I find dat emulating da Chiknees is rather awkward and physically demanding; a 45-degree bow, tip/doff of my hat, or a solemn handshake is more my style when reverently greeting someone.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.