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 favorite song on walls that you stream all the time?"
"defiantly only the brave!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.