Hitting the car in front or back of you while parallel parking in Philadelphia.

Courtesy allows one bump of each car.
That spot was so tight I had to give them the philly bump to fit
by whatupbulance November 29, 2010
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snorting a drug typically ketamine or cocaine out of a nitrous balloon
I got so fucked up after doing that philly bump last night.
by Ekimccm January 7, 2022
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