Sine qua non= essential ingredient, indispensable part of an action or response . 4 years of latin at a real school and you too, may get a clue.
Your profane language combined with your troll accusation, is an essential element of that which is boring.
http://www.merriam-webster.com/dictionary/sine%20qua%20non
You still don't understand even after posting the definition. I'll walk you through it:
You claim that profanity is an "essential element" of boring. But there are many, many things that are boring, but do not contain profanity. For example: watching paint dry, the Rule Against Perpetuities, your previous posts, War and Peace, C-SPAN. To name a few. Therefore, profanity is not "sine qua non of boring, really . . . " Oops.
P.S. - If you actually had four years of Latin, you probably wouldn't have had to look up the Merriam-Webster definition.