Is there a special term, or an idiom, to describe a prank consisting in one person's putting horns (a V-sign) behind the other person's head when photographed?
She made bunny ears behind his head for the picture.
(We call them bunny ears, not horns.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
The rude one is the "two-fingered salute".
I'm not sure if there's an idiom for the "V for victory" salute, so, I hereby coin the following in want of a better phrase:
"Giving him/her the Winston".
To me, a two-fingered salute is not putting two fingers behind someone's head, which I would call bunny ears too. A two-fingered salute is the same as flicking a V- the deliberately rude gesture in the UK made by raising the first two fingers in a V.
Whether it's obscene or not depends on the palm, yes? Palm facing person making gesture=obscene, palm facing audience=V for victory (not obscene) sign?
I have to ask because I'm an American and that distinction is unknown here. An American wishing to deliver an insult with the hand would give the finger, as shown here.
That's right. You will also see the US-style single middle finger being given in the UK.