An adjective referring to something or somebody from Dorchester (see Dot. Ave., OFD and rat).
It is NOT a synonym for "Dorchester," however. As OFDer Jim Sullivan notes:
People from Southie were the ones who called Dorchester "Dot". The only acceptable use of "Dot" was when speaking about the street "Dot Ave" or the public space "Dot Park". Everyone knew you were an outsider if you referred to the actual town by saying "Dot".
Jonathan Lynch recalls: ''When I worked in my dad's store in Lawrence in the 40's, we sold 'dungjareens' not dungarees or jeans. If you wanted Levi's you asked for 'Levi dunjareens.' If you were a carpenter or painter, you would buy 'overhauls' - - not 'overalls.' ''
What you use to signal that you're about to make a turn - or to signal to the guy behind you that you've just cut him off and you want to rub it in. "No one out here in Arizona knows what I'm talking about with that one," reports Mark Badolato. "They only know from 'blinker' or 'turn signal'."