In my musings and wanderings around livejournal I found wtf_omgz. It's not what you'd call work safe. Probably not safe for the home either. Can't really think of anywhere it would be safe really but that's not the point. My curiosity being what it is promoted this thought and I only listed the community for comparative purposes.
Do you know of, or can you find, a more offensive and/or disgusting community than that?