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A name given to a homie when they do something exceptional or amazing. Used when other words can't describe the awesomeness of an occurence or person.
"When Johnny jumped off of his bike into the lake it was the mustard."
by Marki G May 19, 2005
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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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