Thankyouwelcome allows you to both thank and accept thanks in one easy step without the hassle of paying attention to what is going on. Can be used by children, multitasking persons, or businessmen.
"Billy, what do you say to your Aunt??"
"Thankyouwelcome! exits room"
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?"