Being AFK on Facebook, long enough that a moon shows up by your name.

when someone pulls down there pants so to reveal their anus, usually done by someone secrectly proud on their butthole and likes showing it to people, sometimes after pants is droped they stick someones nose into their butthole

a radical song from the Broadway show Grease (it wasn't in the movie)

The price of the stock rising significantly, especially used on r/wallstreetbets.

There are multiple ways to moon people
Stand, naked, use your fingers to spread your butt as wide as it will go before you tear the skin
Or
Stand, lean over a chair naked with your asshole facing the person you’re mooning
Or
If you’re a girl, sit on a chair, spreading your vagina as wide as it will go Facing towards your target.
Or
If you’re a girl, stand naked and squeeze the base of your boobs hard
Or
If you’re a guy stand naked and have the tip of your dick facing the ceiling
Or
If you’re a guy stand naked squeezing your balls with one hand and squeezing your ass with another
Or
Sit or stand, with your index and middle spread out and place your tongue in the middle, where the webbing starts
Or
Like the last method, but adding the ring and weak finger, spreading your ring and weak fingers from your middle and index finger and placing your tongue where the webbing starts between the four fingers

When a stock precipitously increases in value over a short period of time, often due to speculative fervor

When your asset (mostly cryptocurrency) is going up very rapidly.