J.F.K. 

The act of ejaculating so hard in one's face that the sheer recoil of the busted load makes the receiver's head jerk back then to the side (either side will do) much like the unfortunate assassinated U.S. President of the 60's.

Man: You ready for it baby?

Woman: Yea gimme your man-chowder

Man: UGGHHHH! *shoots his load and does the J.F.K.*

Woman: WTF was that?

Man: That...*tiredly* was your first J.F.K.

J.F.K. by TheDarkCharmer October 21, 2009

J.F.K. 

When you are having sex doggy style, and you nut at such an excruciating force, that you hit her in the back of her head with your cumshot.

Jimmy: Hey how did it go with Jenna last night?
Derek: Dude when I was hitting it from the back I accidentally pulled a J.F.K.

Jimmy: damn dude you're a cum sniper!

J.F.K. by BigPubicLice443 December 13, 2020

J.F.K 

getting 365 by a fucking heavy bro is selling my fucking pr lil pump cunt

bro i told you not to peek or you would get J.F.K

J.F.K by we hate all faggots August 17, 2023

J.F.K 

John Fitzgerald Kennedy the president who was shot while in a car

"Hey ever wondered why J.F.K is on the half dollar coin?"
"Why is that?"
"He's missin half his fuckin head!"

J.F.K by Cobble935 May 19, 2020

J.F.K 

You’re fucked

J.F.K

J.F.K by TinPott December 14, 2021

J.F.K.M.O.L.M.A.I.T.O.Y.F.S.M 

Abbreviated acronym for just fucking kill me or leave me alone I'm tired of you fuckin stalking me

J.F.K.M.O.L.M.A.I.T.O.Y.F.S.M defined as I can see you stalking me so leave me alone or get it over with

J.F.K.M.O.L.M.A.I.T.O.Y.F.S.M by AnnoyedbyBRBS June 10, 2022

Shake hands with J.F.K. 

It means "to masturbate".

Brb, ima go shake hands with J.F.K.!

Shake hands with J.F.K. by Adam and Lenny September 3, 2006