Top Definition
A nickname of the township outside of Philadelphia called Upper Darby. It is called this because its full of scum, and roughly 2 of 3 girls are pregnant. Only about 5% of the Upper Dirty population take showers on a regular basis, and all these facts lead to the nickname.
No wonder those kids are such scumbags; They're from Upper Dirty.
by J. Wolff May 15, 2006

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