A special beer pong trick shot move that can only be made when the shooter is in a behind the back shot situation.

When the shooter shoots behind the back, instead of aiming for cups on the table, they aim for a person standing around the table drinking from a red solo cup only. As they take the behind the back shot, they have to call "guest cup" as they shoot it.

A guest cup shot is worth three cups on the table.

A guest cup shot made with three or less cups on the table results in taking away every cup until there is one cup left on the table. you cannot win a game on a guest cup shot.

A guest cup shot is a legendary level beer pong shot.
Ted grabs the rebound of the shot he just missed. He prepares for a behind the back shot.
As he shoots, he calls
"Guest cup." And the ball lands in Natalie's cup. Natalie is an onlooker drinking jungle juice from a red solo cup.
Ted is instantly a legend and the other team must remove three cups from the table.
by mastamixa September 11, 2016
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