Welcome!

I'm not Italian but here's a few words I've picked up from The Godfather and The Sopranos...

Va Fangool - "Go away"
Baked Ziti - Nice food
Madonna - "Oh shit"
Pezzonovante - "Big shot"
Merde - "Shit"
Cent Anni - "Cheers"
Goomar - "Bit on the side"

I hope this helps!! :p