Read about it on Encyclopedia Dramatica.

Here are the rules;

One of the Log in to see images! posts a picture.

You reply to the post with a picture that “beats” that picture. Examples:

A picture of a fat chick beats a picture of a malnourished child.

A picture of a Stairmaster 2000 beats the picture of the fat chick.

A picture of a bucket of water beats a picture of a forest fire.

A picture of someone peeing in a river beats the picture of the bucket of water.

A picture of a dead penguin beats a picture of a live penguin.

Et cetera.

Even though this game is called GIF Wars, the pictures do not have to be GIFs. They can be anything.

A GIF War will go on as long as it has to.

If someone posts something like Chuck Norris or any other old, unfunny meme they’re to be immediately b&.