Mardini and Plawrence have mentioned all that is neccessary. It hasn't actually got a literal translation, but the closest is "Our thing", which indicates that the mobsters who use the term mean that the mafia is their thing; it is available only to them and that no outsiders will ever get close to it.
i'm not that good at explaining such things, but i thought i'd give it my best shot to follow up on the others' answers.
mick
...dot com bold typeface rhetoric. You go clickety click and get your head split. 'The hell you look like on a message board Discussing whether or not the Brother is hardcore?
