V, n.⁸ — Green’s Dictionary of Slang

V n.⁸

[abbr. SE V-sign]

a V-sign, the waving of the index and second finger as a sign of contempt, meaning ‘fuck off’.

2000		P. Howard Miseducation of Ross O’Carroll-Kelly (2004) 190: I’d just flock them the Vs, roysh, or sometimes just give them the finger.
2012		D. O’Donnell Locked Ward (2013) 159: She could see the [...] bitch at the picture windows. So she flicked a double set of V’s at her, mooned and then made good her flight.

give someone the V (v.) (also flick the the Vs, give something the V)

to the make obscene gesture known as ‘V-sign’.

2000		N. Griffiths Grits 323: Another jet roars over an a neer shit meself an give it the V.
2001		I. Welsh Glue 69: We gied um the v’s back.
2017		Twitter 25 May 🌐 My granny once flicked the Vs at a vicar because she thought it was the same as a thumbs up.