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v. To tap ones toe while sitting in a public toilet stall to inform potential users that the stall is occupied.
A guy walked into the bathroom so I had to start doing a Fred Astaire.
by Erik November 11, 2003
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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