April 4th (4/4) is International Rock Beat Day. A "rock beat" or "common time" is four beats per measure of music, the standard rhythm of most popular western music.
"We've got to play some Beatles records on April 4th... it's International Rock Beat Day!"
If someone goes for a pound and you go for a high 5 and cover their fist, you say "paperbeats rock." If done intentionally this should be considered a diss worse than to leave hanging.
He tried to pound it so I went for a paperbeats rock. He was so embarrassed, he had to leave the party.
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?"