What does sic mean?

I have been wondering what [sic] meant for a long long time. I have seen it a bunch of times, and used context clues to determine that it meant something about a mistake in a quote. I saw in my Gmail Web Clips thing (is that still only for a select few?) that Ask Yahoo explained what it meant. So basically it means that the mistake in the quote is not my fault. I feel so relieved to know. Now I can use that all the time when I'm quoting wrong quotes.