Italian for either "This thing of ours" or "Our Thing" depending on who's translating. Used as a euphemism for the Italian mafia.
Once you're in La Cosa Nostra, you can't get out.
by Jimmy February 6, 2005
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the name for mainly the american mafia, also other offshore italian based mafia organizations, aswell as the huddersfield mafia in england known as the tetsuo family.
the tetsuo family / genovese family are examples of la cosa nostra.
by ntfx April 3, 2003
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