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When you write a message on a desk for someone else to see later. It could be on purpose, like leaving a note for your buddy who sits at the same desk, or it could be a mess, like leaving a bunch of stupid doodles or your failed math test answers for the next person to suffer through.
I drew a mustache on my buddy's face in permanent marker before lunch.
My desk was covered in math problems and a drawing of a chicken wearing sunglasses.
I wrote 'You're gonna fail' on my friend's desk in red pen.