When you greet someone with a handshake and they don’t want it. So you grab there hand forcefully and shake hands anyway.
‘Did you see scummo on his latest meet and greet. He was rapeshaking his way around town one victim at a time’. ‘Keep your hands in your pockets kids, otherwise scummo will rapeshake you’.
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"