When a person hides between the bed sheets and covers of another's bed and waits for them to lay down on top of them. Once they lay down, the person from below immediately grabs them like a monster that hunts in the sand
Sandmanst, a user popular in the REDACTED discord server (and my heart).
He is a skilled artist, who when asked what he thinks of anothers art, will not comment until severely put upon.
He also often blocks people (undeservedly), and then refuses to elaborate on why he doesn't love them.
"Wow, are you a sandmanst? Because you blocked me won't tell me why you don't love me! "
"What do you think of my art, sandmanst?"
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.