Inane worldbuilding minutia of the day: there is a viral dance craze in Runaway to the Stars "modern day" (approx. 2325), because what is society without a viral dance craze. It began on Martian social media and then spread to the rest of the human internet via the extranet social platform Megaforum.
It is called "The Whop."
It takes some skill to to whop quickly without losing your balance, and videos of skilled whoppers dancing in increasingly ridiculous and inconvenient locations has plagued the human internet for years now. It has a resurgence every time a new bubble of human space discovers and spreads it.
There is also a two-person version of The Whop:
Two-person whopping is extremely popular among children, much to the dismay of their elders. If you don't pay attention and keep time with the other party, it's extremely easy to slap them square in the face. Video compilations of people getting injured while whopping abound. School nurses have seen many victims of the viral dance, sent in with bruises and bloodied noses after whopping too hard.
my wife came into my room the other day doing the whop and then tried to two-person whop with me before i told her Absolutely Not, Your Arms Are Longer Than Mine And I Will Get Accidentally Slapped. so we just solo whopped at each other for a bit. the whop is real and strong and my friend.
in business news, burger king has attempted to capitalize on the viral trend by temporarily renaming the whopper to the "whop-er"