SPAM

From BluWiki

Spam is a form of cured pork, which remains popular in the United Kingdom, and comes in a squareish tin.

It is also a name for the reams of junk email that go to almost every email address in the world, and also for the practice of placing lots of keywords on a web page / blog entry / ebay auction, so more people find the page even if it is not what they were looking for.