[Public Service Announcement.]
We all get "passionate" from time to time. The result most often is that our language goes to heck very quickly. Common problem. But in a work environment you can imagine this could be a big problem.
I found this little cheat sheet to be quite handy. It is a great way to ensure you still communicate your feelings, but take the foul language out.
Admittedly this will reduce some of the "passion" you meant to express, but on the bight side you'll still have a job!
I hope you find it to be helpful.
Source: Imgur: http://goo.gl/FN4xK