A term used in Connecticut for the dance that was made in the 860 area code, particularly Hartford. It involves imitation of common activities such as making a Rubix cube and shooting guns.
"Yooo you saw how he was freaking it at the party? I wish I could dum out like 860 heads."
"I'm a pro at dumming out, play some Gangstalicious for me."
"You cant dum right my guy, you're from 203."