When looking at Spanish learning site’s lessons at lomastv.com, I came across something about the nature of language I found interesting. It was the following statement:

The dictionary states that en bolas is itself considered vulgar by some. We don’t remember where we first came across the phrase, but for some reason it stuck with us, as colorful phrases often do. Could it be because certain speech operates on a whole other neurological plane that quite literally bridges logic and emotion?

There was then a link to a site with an interesting article you can find be scrolling down called Why We Curse: A Neuro-Psycho-Social Theory of Speech found here.