Top Definition
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
1 more definition
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

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