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Putting the penis inside the vagina. Originates from the fact that the head of the penis looks just like a Nazi helmet.
So what did you do with your girlfriend?

Oh just played a little game of hide the nazi!
by what? shut up February 28, 2009
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Inserting a penis into the vagina. Possibly based upon the position of an erect penis compared to the salute of a nazi.
by oldmanklc7734 November 03, 2006
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