JFK'ing 

When you are so tired your head falls violently rearward, as if you were just shot in the head.

"Damn Jeff, are you allright?"
"Yeah man, I'm so tired, just keep JFK'ing"

JFK'ing by KGriz November 20, 2016

JFK-ing 

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.

JFK'ing it by Pornhub.com/xX360NoSc0p3Xx January 27, 2016

JFKing 

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