1. A type of flick or thump. One that elicits a great amount of pain and forces the victim to emulate the JFK assassination. Typically this is done immediately on impact with a sudden head thrust that sends the neck into hyperflexion and then into hyperextension.
1. Boom Bitch! you just got JFK fingered.
2. Did you see the way he flicked him on the head, that was a textbook JFK finger.
3. Damn, that bitch got JFK fingered so hard she got a nose bleed!