I have lived and spoke Italian for over 20 years and know various cadences. The call seems somewhat inaudible due to the age of the film and sound. However, based on what I can make out, this would be the term for "idiot" or more vulgarly put "asshole", "creep", "fool." A result of it slipping through the dubbing process. This was common during the early days of international releases. Since it is a scene based in Venice and the expression happened for a split second, the dubbing artists felt it not necessary to interpret for an English speaking audience. This is my best guess. However you may want to explore some aspects of Venetian dialect if the original version was done in that language. Italian language and films have had less time to "standardize" their language than some of the other Romance tongues and thus, dialectic words often found themselves to be inserted into films. Please see cited of Sophia Loren in "La Ciociara" where she states, "Ma si po' sape' ca vojiono chesti?" - Standard Italian: Ma si puo' sapere che vogliono questi signori? This is a prime example of Campanian/Latial dialect used in the original. See link: https://ok.ru/video/4500327172838