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1.
It's a way to end a conversation you started. Only you can zitto (end) a conversation which you stated and no body else. Same holds true for the conversations started by others. You can't zitto other peoples conversation.
Herman: hey Reena ... who do you like the most "your boy friend or me"

Reena: you cutie pie .. no doubts on that. Who do you like the most "me or your girl friend"

Herman: ummmm .... zitto

Reena: Damn it!
by themindblogger April 16, 2010