Here’s another book you’re sure to get a laugh out of: How to Insult, Abuse and Insinuate in Classical Latin by Michelle Lovric and Nikiforos Doxiadis Mardas.
I found this book while randomly browsing on BookMooch and thought it might come in handy for those situations that just call for the choicest words.
For instance, when your credit card company calls you to follow up on your latest payment, instead of muttering “Monkey-faced money-lender!” you could exclaim its Latin equivalent and sound so much better “Cercopithece Faenerator!”