A wholesomeday hosted each year on October 29th. Whether you're the Griffin getting slapped, or slapping that same Griffin, at the end of the day, no ones actually harmed so don't be a little shit about it.
Person 1 "Hey Griffin! It's October 29th! You know what that means."
Griffin "OW! Haha, I sure do love Slap Griffin Day!"
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?"