Describe Describe Topic Here here.
Before this page was created, that's all that would've been here if you'd looked. Heck, before the "database hates you" message was added, that's all you might have seen afterwards, as well. It was part of the PmWiki software powering TV Tropes for a long time, until it was superseded in December 2009 by "Click the edit button to start this new page." Some tropers decided they want to be clever and used the phrase in actual articles. And some tropers still use the phrase to this day.
MediaWiki itself once lacked such a message, but All The Tropes has similar wording in some of its "boilerplate" for new pages. For example, the work page boilerplate:
Describe the page here. Remove this line when you place a description on the page. MediaWiki now has such a message, however, and the version on All The Tropes is visible here.
In some cases, it can give self demonstration of a trope, but in a small form that doesn't make the proper article hard to read. In other cases, it can seem like shoehorning a joke. So be careful when using this.