Then smiling, he untied his fair braguette, and drawing out his mentul into the open air, he so bitterly all-to-bepissed them, that he drowned two hundred and sixty thousand, four hundred and eighteen, besides the women and little children.
A braguette is the french word for "fly." To further explain, it's the zipper and button on the front of the pants. I found this sentence unnecessary but a funny detail when I first read it. Although when I reread it, I realized that it showed the amount of disdain he holds for the people of Paris. He claimed they were foolish earlier, but relieving oneself with your chin up in defiance is a true slash at their dignity.
Source: Editors, Cambridge University Press & Assessment. “Braguette.” Braguette in English - Cambridge Dictionary, Cambridge University, dictionary.cambridge.org/us/dictionary/french-english/braguette.