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Short for Staff Assistant. Staff Ass is a Washington insider term to refer to the young, hot, female, low level employees that are commonplace in the offices of most male members of Congress. Staff Ass are often looking to climb the career ladder in politics, and therefor easy scores for higher ranking Congressional staffers.

The term first came to prominence when used by the notorious Washingtonienne.
Dude, I want to slam the new Staff Ass in Senator Voinovich's office! She is fucking smoking!
by Venizuela October 24, 2009
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