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a standard of measurement when referring to the male genitalia, term can be used to measure either length of the penis or circumference depending on the context of the sentence
Length : "Girls, I realized that my husband turned out to be 3 Asian Pinkies long on our honeymoon!"

Circumference: "Girls, my gyno said that my future husband can't be any bigger than an Asian Pinky because my twat is so tight!"
by HungWho February 08, 2010