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
by Raidon January 14, 2008
Get the sandmonstermug. an annoying person, a person who get's on people's nerves without a reason, or a person who hurts your feelings.
You're such a sandmonster.
by THEJJN February 14, 2024
Get the sandmonstermug.