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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.
JFK-ing by JFK-ing around January 20, 2012

JFK'ing it 

When you duct tape a 12X scope onto your member, then proceed to ejaculate onto a cardboard cutout of JFK and his wife across the room.
JFK'ing it; Example- me and my friend were messing around and I accidentally JFK'd it on John face.
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."
JFKing by vegancitygirl August 27, 2010