The definitive statement that proves anything you say is an inside joke. Best used when everybody gets the joke or when the statement is in no way a joke.
one of the best songs by singer-songwriter Louis Tomlinson on his debut album "Walls" that the lgbtq+ part of his fandom has claimed because of its lyrics.
"what's your favoritesong on walls that you stream all the time?"
"defiantly only the brave!"