Translated into good old English, it means "Help! That man is following me...!"
Sometimes, you might even need to tell them: "Non mi toccare!" which means "Don't touch me!"
Not to worry... Italian men are generally extremely well behaved and are fine gentlemen. This is for the rare few who get very enthralled with foreign women and female tourists.
So, Ladies, as you're walking along the streets or piazzas, don't be surprised if you're being tailed or whistled at; OR pursued by squadrons of Vespa-riders. Just take comfort in the fact that Italian men are not known as 'Romeos' for nothing. In short, continue to act cool, ignore them and simply carry on walking! :-)
If you're being propositioned by a hot Italian hunk looking like Raoul Bova, I'm sure you would like to know what they mean. So, remember these words:
"Vuoi uscire insieme?"
Feel free to slap 'em (joking!)... or say 'Si, per favore!"
Ladies, that hot Italian guy has in fact just asked you out on a date. ;-)
"Vuoi cenare con me?"
He's just asked you to have dinner with him. :-) Feel free to reject or say '"Si" (read: Yes) to him.
If you're not interested in being picked up by any guys, gals or apes - simply ignore them and they'll go away soon enough. OR you can duck for cover inside the nearest bar!
If you do really get into trouble and need to call the Roman Police, just remember these phone numbers: 113.

