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.
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