May also be called the beach monster. The act of doing your woman on the beach, finishing on her face, and then throwing sand in her face. Because of your "Finish" the sand will stick to her face, and sand will most defiantly go in her eyes making her mad. The combination of the two makes a sand monster. This can also be done in your home, but with the use of cooking salt instead of sand.
"Yea me and betty did it on the beach, and i gave her a sand monster"
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