I remembered some words and phrases that were used by my grandmothers that I never heard anyone else use. They both lived in southwestern Pennsylvania but these words seem to be outside of the realm of Pittsburghese. (Yeah, that's a real word, sort of. http://en.wikipedia.org/wiki/Pittsburghese)
From my Grandma Kallenborn
Darsn't = should not, better not, or dare not. "You darsn't jump off of the top stair."
Rench water = rinse water. When she washed the dishes, she filled one basin with soapy water and one basin with "rench water".
From my Grandma Staymates
Down street - This is what she called downtown in the little town where they lived. "He isn't home now; he went down street." She only used this word in reference to the town where they lived, not any other town.
Poodaloobish - I am spelling this as it sounds. As I remember it, it is a reference to a child, e.g. "Janet is going to leave Poodaloobish here while she goes to the store." It is not an official nickname. Anyone can be Poodaloobish.