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Extra shirt that comes partially untucked because of movement such as raising ones arms and makes one look like one is flabby. Especally when the shirt is a dress shirt with a tshirt underneath.
After a long day at McQuaid Phil had a large amount of shirt flab hanging out.
by javaguy89 December 19, 2007
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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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