Space Invaders
A classic arcade game where you pilot a spaceship, at the bottom of the screen, shooting aliens that fly from a formation above you and dodging their own projectiles. I can't believe no one has tried to define this term yet.
Example:
(Example is from The Simpsons):
Willy: It's impossible for me to fire a pistol. If you'll check me medical records, you'll see I have a cripplin' arthritis in me index fingerrrs. Look at 'em! holds them up I got it from "Space Invaders" in 1977.
Wiggum: Aw, yeah. That was a pretty addictive video game.
Willy: surprised Video game?
(Example is from The Simpsons):
Willy: It's impossible for me to fire a pistol. If you'll check me medical records, you'll see I have a cripplin' arthritis in me index fingerrrs. Look at 'em! holds them up I got it from "Space Invaders" in 1977.
Wiggum: Aw, yeah. That was a pretty addictive video game.
Willy: surprised Video game?