Top Definition
The act of putting coins or other money under your foreskin for either pleasure or convienience.
If the bearer of the coinage experiences an erection whilst holding money and they spill onto the floor this is called a Japanese Payday.
John lost his wallet, so he started using his Japanese Purse.

As Julie was about to give Mike head his Japanese Purse opened and she experienced a Japanese Payday.
by Japs Eye May 08, 2006

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