brains jump out the top like jack in the box

(v) The act of shooting somebody in the head. Popularized by the 50 cent song 'Heat'

Man, I was playing Gears of War and made somebody's brains jump out the top like jack in the box.

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brain jump

When your brain shuts down for a split second and when it starts again you yell "Brain jump!"

Hoon(staring in space): "Brain jump!"
Everyone else: (Oblivious to him talking)