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The amount of the penile shaft that is hidden by a fully grown out pubic bush.
Guy 1: “man, my dick is not looking too impressive today... I hope she thinks I’m big enough...”
Guy 2: “make sure you’re clean shaven! You’ll gain access to the secret inch!”
Guy 1: *shaves* “Woah! Now you can see all two inches!”
by peeemthreek July 20, 2018
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