Top Definition
When fucking the same bitch over and over, but ya just can't bust a nut, but as soon as change bitches, you spray your load over the new bitch's face!

A dirty philly is that first bitch.
it was had to keep a hard on for that dirty philly.

philadelphia is home to a lot of dirty phillies.
by Nebuchadnezzar June 18, 2004

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