Green’s Dictionary of Slang

(US) a statement of dismissal or contempt; general aggressiveness.

1976		L. Bangs in Psychotic Reactions (1988) 189: It was a giant fuck you, but not precisely the way you’re saying it.
1994		T. Willocks Green River Rising 75: On some level maybe her work was a big Fuck You to all of them.
2007		C. Goffard Snitch Jacket 16: I was never a lover of fire myself, but [...] I could admire the purity of the fuck-you that it represented.
2007		L. Redhead Cherry Pie [ebook] Good to see the place [i.e. a fried chicken shop] was still [...] sending the National Heart Foundation a cheerful ‘fuck you’.
2012		C. Ashley ‘This Town Is My Town’ in Crime Factory: Hard Labour [ebook] What Sarah kept was a key. On the surface it wasn’t much of a Fuck You — the key was just a key nobody would miss.
2015		L. McInerney Glorious Heresies 269: [T]he half-drained bottle of whiskey he’d brought as a fuck you.
2023		R. Milward Man-Eating Typewriter 415: ‘[A] great big fuck-you to the Establishment’.