A nickname borrowed from the common apple which is used to describe an extremely attractive female who easily turns red due to any kind of embarrassment or laughter.
Casper: "Hey girl, you're super cute."
Jessica: "Awww stop it! You're making me blush!"
Casper: "You're even cuter when you blush. You're a Red Delicious!"
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.