2 definitions by skc107

Top Definition
The last person to date someone before someone started dating his/her eventual spouse.

First coined by the writers of 'Freakanomics'.
Jenny is such a penultamour, her last three exes have already walked down the aisle!
by skc107 January 13, 2009
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An episode of LOST that is Jack-centric.
"Dammit! ANOTHER jackback this week?
by skc107 May 30, 2007
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