Do you know, that gesture, what does it mean in italian? 
Yes, that thing. The one that males don’t have.
I am absolutly not surprised.
(now, I have a doubt: did you know already, were you ironic, or sarcastic? I know the right answer to escape from this situation, ThimbleCon '87 taught me:)
OK.
According to Ronnie James Dio he got this one from his italian grandmother:
So I guess, that´s italian (to fend off the evil eye).
Well, with all the respect for his grandmother, that gesture means “you are a cuckold, he/she cheats on you”.
Gestures and words meanings change over time. Gay used to mean happy. The “Victory” and “Peace” hand sign are one and the same etc.
But it’s also used as an apotropaic gesture to shoo away bad luck. Just like touching your own… 
.
Anyway, I love the “italian hand gesture”. And I love when I see a foreigner doing it, because you can tell he’s a foreigner by his “accent”. Yeah, if you’re Italian you can see accents in a hand gesture.
I don’t like people who use too much gestures. They are part of my culture, but they should be used wisely and with moderation, in order not to appear coarse. Some italian people when talking seem they’re helping a 747 for its landing.
One thing always surprises me: everybody always talks about italian gestures, but what about american gestures? Only USA can compete with us in matter of gestures. At least I can find some sense in italian gestures, I sometimes feel like Americans are just waving hands as to mimic a rapper…
I love the way David Lynch constantly moves his stretched out fingers when he talks. Can´t find out a video of it right now, but it always looks like he was playing an invisible harp or something.
Btw… I realize now I replied to a thread 8 months old… how come I stumbled into it? I thought it was actual…
It´s because @Gffp linked to it in a quote of @ZakPhoenixMcKracken me in this thread:
That’s right, japanese ogre.