All languages borrow words from other languages because of new concepts, inventions, traditions, etc. Just out of curiosity, read this article by Jessica Phelan from GlobalPost. See how the French have adopted and adapted the English language to their needs. Here is an example: Une pompom girl, which means cheerleader.
Click here for the article entitled “A beginner’s guide to Franglais”, the second part of which has some of the French words and phrases that Americans should only use in America!