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I would not call this one slang as it is basically a literal translation. In general it means to keep going when you have no energy left. It broadly comes from engines that ran on vaporous fuels; piston engines and the such. Most fuel tanks that hold liquid fuel have some sort of a float which reads the level, the phrase comes from the idea of running the tank "dry" or empty to the point where the float bottoms out (or reads empty) but the engine still runs. Its based on the loose idea that the free area in a fuel tank is filled with vaporous fuel and you could run the engine on the vapors at the end of your fuel tank since the final step of most fuel systems is to vaporize or atomize fuel anyway.

I would not call this one slang as it is basically a literal translation. In general it means to keep going when you have no energy left. It broadly comes from engines that ran on vaporous fuels; piston engines and the such. Most fuel tanks that hold liquid fuel have some sort of a float which reads the level, the phrase comes from the idea of running the tank "dry" or empty to the point where the float bottoms out (or reads empty) but the engine still runs. Its based on the loose idea that the free area in a fuel tank is filled with vaporous fuel and you could run the engine on the vapors at the end of your fuel tank since the final step of most fuel systems is to vaporize or atomize fuel anyway.

I have made this answer a community wiki, so we can avoid pointshopping and flood of conflicting answer. Only edit this if you are sure of what you think you know.

I have made this answer a community wiki, so we can avoid pointshopping and flood of conflicting answer. Only edit this if you are sure of what you think you know.

Copy Shot = Unknown, although maybe referring to a carrier catapult launch or an aircraft missile launch.

This may come from a multi-aircraft flight during combat, or while flying top cover where an aggressor situation happens. "Lined up for a shot" (missile lock), then "missile's away" (launched missile) and the flight wingman might respond "copy shot" acknowledging the other plane has launched a missile.

May also relate to an aircraft carrier, where being launched from a catapult, is being "shot."