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1.
lying on a grassy knoll with your boyfriend or girlfriend, preferably while watching fireworks.

also, the term can be applied to semi-public makeout sessions while lying on said grassy knoll.
"Dude, we were JFKing it all night on the 4th."
by vegancitygirl August 27, 2010
 
2.
the act of splattering all over her while she screams and tries to get out of the car.
Brian likes JFK-ing girls on the 1st date, thats how he landed Danielle.
by JFK-ing around January 14, 2012