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1.
Pittsburghese for "downtown"
Hey!! Y'uns guys goin' dahntahn to see dem Stillirs?
by Italian Stallion October 11, 2004
 
2.
The cluster of buildings in any metropolitan area; otherwise known as "Downtown"

Generally exclusive to the Pittsburgh area.
yinz goin' Dahn tahn?

by Munda November 22, 2002