It is when you attach a lens in reverse to the camera body, as in the front element of the lens is facing towards the camera body while the rear contacts are outward. Adapters are specifically made for this purpose.
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Yep! These were taken with a reversed 50mm f/1.8 Nikon lens. I reverse it with my badass old Nikon BR-2 all-metal reversal ring (that apparently can damage AF cameras if you lock them, so I just twist it in a little). I couldn't find my 28mm lens today. The lower the focal length, the higher the magnification when reversed.
That's pretty cool. I never even imagined that you could do such a thing!