jump box 

A portable battery used to jump start a vehicle with a dead battery.

The jump box has two wires coming out with clamps on the end; it also has a wall plug and a charge meter; must be for jump starting a vehicle.

jump box by a clever ud user September 14, 2009

box jump 

the practice a team adopts, in an office messaging environment, of taking turns responding to group email.

"joel was sick, and told me he wouldn't be able to box jump...so he asked me to jump into the box for him"

box jump by michelle scoma March 24, 2007

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.

brains jump out the top like jack in the box by DieLawn September 6, 2007