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1.
The act of inserting your penis in any bodily orafice in a surprising and or speedy manner.
Julie was just sitting there with her mouth hanging open, so I went straight for the weeniedunk.

John: Hey Kim, I think you dropped your bracelet.
Kim: What? (bends over)
John: Weeeeeeeeniedunk!
by Doselan July 07, 2010