The Vietnam Cage is a secret sexual position. You may see it as the hidden boss at the end of a videogame.

The only way to know what a Vietnam Cage is is if someone did it to you beforehand. Only those who lived through the Vietnam Cage know what it's all about as it is indescribable.
Him: What was that, what you were doing at the end?
Her: It was a Vietnam Cage.
by Gengar Used Lick April 22, 2017
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