1 definition by mlq

Top Definition
When you blow your load in a chick's knee pit after a good knee fuck, and then have the girl jump on an exercise bike. The squishy sound of sticky cum in her knee pit is the Philadelphia Plunger
Did you hear about Billy? Last night he totally recorded a Philadelphia Plunger he gave to his secretary. He uploaded it to iTunes.
by mlq December 09, 2007
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