Top definition
When that cheap rubber band or the staples that hold the rubber band in place on your Halloween mask break.
OMG! Everyone at the party thought I was George Bush until my mask came off.
by Ghost of Halloween past October 31, 2004
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2
An embarassing exposure that can be blamed on clothing.
No, Janet didn't flash the world on purpose. That was a costume malfunction.

OR

Oh, my fly's down? What a costume malfunction.
by Rachel February 03, 2004
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