When one places one's penis and Testicles behind ones legs, conveying the illusion that a vaginal canal is present when there is in fact a hidden dong.
The maneuver goes back thousands of years and some even say Hitler was spotted performing the act after consuming large amounts of Jagermeister.
The act was brought to attention in popular culture by such figures as Buffalo Bill and even Jay in clerks 2.
Mussolini: Adolf, what the hell are you doing?
Hitler: (standing with dick tucked between legs) Mongolian sex change, yo.