I thought the Italian hand gesture was the fingers under the chin flicked forward. That picture looks more like the “Darn...I could have had a V8” gesture.
Uhh, not that one. I think the call was for the Italian Salute, right arm extended, left hand slapped firmly on top of the elbow of extended right arm.
Usually executed with the expression “Ba fongul”or “bafungul”
which means in Italian just what you think it means.
I think the suggested hand gesture involves the open hand being drawn accross the underside of the chin....and I think the gesture can mean anything from “go pound sand” to “go commit fornication upon yourself” to “drop dead!”