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 waya 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!"