YouTube Watched Filter for Chrome
More About YouTube Watched Filter
The YouTube Watched Filter logs the videos you clicked on from the results page so that next time you make a YouTube search, you won't have to see the same video results.
You can choose whether you want this Chrome extension to filter the search page manually by pressing the filter button in the pop-up, or choose to filter them automatically specified in the options page. If you don't want the extension to log videos you click on from the results page, you can tick off enable in the pop-up.