Hola Tiger, ¿Para qué necesitas aprender palabras feas en Español, cuando este idioma es de una belleza inigualable y pleno de términos suaves y bellos?. En Español encuentras las más hermosas y variadas palabras para expresar cualquier tipo de ideas sin necesidad de usar términos desobligantes. ¡¡meow!! (= '-' =).

Yes, I know many.

Why do you ask?

I thought nobody would answer this question . Que sorpresa!

Jajajaj... I'm a well educated person, but I won't rend my garments telling you I never say 'bad words'. Your question is the typical question a teenager makes in my country when they start learning a language (English for example). --- I share with you two links about a Language Congress where an Argentinian writer (also humorist) spoke about 'Las Malas Palabras'. I'm not sure about your Spanish level, but I share them anyway. After all, these videos could be a great listening practice. :) http://www.youtube.com/watch?v=ErGLhqYJOrk (part 1) http://www.youtube.com/watch?v=qHwnYJ22oFU&feature=related (part 2) (There you'll learn some bad words in Spanish). If you want to know more of them just send private italki messages. :)