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Placing a cup upside-down with the open top, or the "cup side", downward, with the rim of the cup on the surface.
Dain, stack these paper cups cupside-down in the storeroom.
by The Fairy-Godmother's Helper September 12, 2010
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When a cup lands on the ground with the top part touching the ground.
Mike " It landed cupside down.."
Matt "..."
Mike "Haha, do you get it?"
Matt "..."
by FTB2008 October 07, 2010
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