In 10 pin bowling, if you hit all the pins on the first ball, it's called a strike, if you hit all the pins on the second ball, it's called a spare, but if you leave some pins up, then you're open.

When you try to strike someone with a diss, and you totally miss your target, then you are also, open.
Person 1: Your mama's so fat that when she sits around the house, she really sits around the house.
Person 2: My mother died of a heart attack last night.
Person 3: You're OPEN!
by SXChen November 24, 2009
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