zap 'em up

Noun

 * 1)  A shoot 'em up involving energy weapons.
 * 2) * 1986, Luke C, Battle Of The Planets (video game review) in Your Sinclair issue 3
 * This is not your average 'zap 'em up' game. The alien craft all have different characteristics, and judging a spaceship's speed as you home in for the kill is something you'll get the hang of only after much experience.