“All Your Base Are Belong to Us” is a classic internet meme that has been commonly used since 1998. Most of the early versions took the form of flash animations, although the meme has spread to Youtube videos as well.
The horrible grammar present in “All Your Base” is an example of Engrish. Engrish is a phrase that is originally written in an Asian language but translated badly into its closest English approximation. Typical Engrish replaces L’s with R’s. Quite often, instances of All Your Base are accompanied by the song “Attack of the Gabber Robots” by The Laziest Men on Mars; a song created using samples from the game.
The phrase and game footage used in the meme come from the 1989 side-scrolling arcade shooter Zero Wing.