The act of taking a shit in someone else's bathroom, not flushing, and waiting for the victim to follow the smell to the source of the problem.
After consuming 3 cheesesteaks, Bill hit the bachelor's bathroom with a huge Philadephia Deposit. The bachelor then followed the smell to the source of the problem and realized he had been the victim of a Philadelphia deposit. He immediately flushed the toilet, but the smell had already defused throughout the hotel room.
by Francois1980 January 20, 2009
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