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.
by mburket March 16, 2008
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.
by Party Guy March 31, 2009