Ok so, the SiteLinks link for somebody.

http://www.google.com/support/webmasters/bin/answer.py?answer=47334

Its true, these are algorithmic constructions based on what people search for. They're only generated if people search for "reddit" then re-search later for "reddit X" (in this case "reddit jailbait"). Google views this as people's search not being specific enough for just "reddit" and so tries to give you the top options.

This likely means jailbait is among the top subreddit searched for on google. So to permanently remove it, we'd have to get rid of the subreddit. Or change the subreddit's robots tag to noindex, then request all the pages in it be removed (They do do this). But that would prevent any of the links from showing up in Google.

We can demote it but you need to go back to the SiteLinks page every 90 days to reconfirm the list. And its not 100% guarenteed (I suspect it simply adds a very large negative towards its score - one that can be overridden by sufficient traffic).