This form does not allow a rating of NO STARS, so I had to give it one, even though it doesn't deserve it. For someone who really wants to learn "dirty" idioms in Spanish, Street Spanish (published by Wiley) is MUCH, MUCH better. Frances de Talavera, in Mierda, goes for shock value ONLY and many times gets things wrong. Street Spanish, on the other hand, focuses on many idioms which people actually use, plus it contains a section on how to avoid saying something embarassing (or unintentionally obscene).