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1.
The ultimate euphoria derived from drinking or doing shots of Jack Daniel's whiskey!
I hope to have a jackgasm tonight after work!
by Jilina March 16, 2007
 
2.
An expression of love or lust for Jack from ABC's TV show Lost.
Girl whatching Lost: OMG, Jack just jumped in the water! OMG!!!

Friend: Are you having a Jackgasm?

Girl watching Lost: OMG, yes!
by Millancad November 25, 2006