a term used(in beer pong)to label a cup that has water or beer beneath it. When a ghost cup is hit it slides and moves around the table as if a ghost were moving the cup.
"Hey! Clean up those ghost cups!"
"Make sure the table is dry we dont want any ghost cups."
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A beer pong related term where the middle row of the rack has been removed. All that is left is the back 3 and the front cup. The removed/invisible center row creates difficult perception.
I can never hit that dreaded Ghost Cup!!