"stronzo" is a very nasty term that translates basically to "turd," but it is much dirtier than that. it is one of the many, many italian swear words.
"Don Corleone, I am honored and grateful that you have invited me to your daughter... 's wedding... on the day of your daughter's wedding. And I hope their first child be a masculine child. I pledge my ever-ending loyalty."
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