Origin of "wang" as slang for your dick?

As the title asks…

-FrL-

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As always, start with the Online Etymology Dictionary:

Short(snic!) for tallywacker.

Paraphasing Stephen King, circa 1985: I just got my first word processer. It’s a big Wang, and keep your smart comments to yourself, buddy.

“I spent all last night pounding on my Wang…”