Finalsese
A word that, when used, automatically wins any and every argument without competition. This word cannot be overruled by another word or a finalsese on top of it, for finalsese are final.
Jeff: "No way dude. You will never win this argument. I have the better claim, evidence and reasoning, along with a well-crafted conclusion ."
Jon: "That would be true, but I must end this argument. I am right and I call finalsese."
Jeff: Screams while he slowly melts into a puddle of heavily acidic bodily fluids before the said fluids combust with the oxygen at such a fast level that a nuclear explosion is set off, killing Jon as he mutters his glorious last words"
Jon: "You can't beat a finalsese, Jeff. I win."
Jon: "That would be true, but I must end this argument. I am right and I call finalsese."
Jeff: Screams while he slowly melts into a puddle of heavily acidic bodily fluids before the said fluids combust with the oxygen at such a fast level that a nuclear explosion is set off, killing Jon as he mutters his glorious last words"
Jon: "You can't beat a finalsese, Jeff. I win."