Happened to me also, couple of times. And i also thought that certain words trigger a filter - but this is not exactly so.
3 days ago, I reworded my post, and i was completely sure that i was saying nothing wrong - the least pretty word used was "dirty", and i was careful to not be offensive at all. And again, that post is still not shown. In principle, if some word is "bad", then every post containing it should be stopped at first, automatically.
My 'censored' posts were pretty long. I don't know what triggers this "filter". But my guess is, the mods appointed don't have enough time to review everything filtered. Which shouldn't be so, imo.