Dictionaries of slang and swear words

I had a problem these days because I didn't know the meaning of a swear word and asked what the word meant, but some people complained. After that incident I searched for some help and found it on Urban Dictionary. It is a slang dictionary with thousands of words and growing. But I searched for more and found The Alternative English Dictionary - Slang, profanities, insults and vulgarisms from all the world. A nice place to find not so nice words, it has a a PDF version, useful for vacations.

And there is more: a swearsaurus: The Art of Insults. Offensive jokes, an insulting slang dictionary, the world's largest multilingual swearing archive of 165 languages, random insult generators - you'll find them all here. I took a look on Brazilian Portuguese Language Swear Words page and I had some surprises. I didn't know many of the words and expressions of the list and I can't use most of them, because they are too rude for my taste, even when I'm very angry. I tried also the Portuguese Language Swear Words list but didn't find some of my favourite expressions (no, I won't write them here).