When a guy cums on a girl's back while she sleeps and then sticks a cape (blanket) on her back, thus making her superman. Men usually do this because they are pissed at the girl for some reason.

Used in the AIDS filled song of "Crank that Soulja Boy"
Dude, I totally supermanned my girlfriend last night because she wouldn't blow me.
by BobGre December 30, 2008
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Superman is a fictional character and the staple superhero of DC Comics. He first appeared in Action Comics #1 in 1938 and is considered the first character to embody the particular combination of traits that characterize the modern superhero.

The comic book character, created by Toronto-born Joe Shuster and Cleveland-born Jerry Siegel in 1932 and sold to Detective Comics, Inc (today DC Comics) in 1938, subsequently appeared in various radio serials, television programs, films, newspaper strips, and video games. As was written in the first edition of Action Comics #1 (June, 1938), Superman is born on the planet Krypton and as an infant is rocketed to Earth by his scientist father, moments before Krypton explodes. The rocket lands on Earth, where amiable couple the Kents find the baby and adopt him. As he grows, he discovers that he possesses powers far beyond those of mortal men and women and resolves to use them to help others. When not fighting the forces of evil as Superman, he lives among humanity as "mild-mannered" Clark Kent, a reporter for the Daily Star (later changed to the Daily Planet). Clark works alongside reporter Lois Lane, with whom he is romantically involved. In current comics continuity, they are married; however, the character has several other relationships throughout his years in comics. Today, the character's adventures are published in a number of comic books.
Superman is a great superhero of the DC Comics
by P.redeckis June 7, 2006
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The Superman is a sex position, where a guy has sexual intercourse with a girl, doggy style, and bends the girl forward while he reaches over her shoulders to plant his hands on the floor, supporting his weight, while his legs are sticking straight out. The posture has the man resembling a flying Superman.
The Superman position was out long before that Souljah boy garbage got everyone confused as to what it actually does mean to "Superman that ho".
by Wizard Toast October 3, 2010
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The world's greatest superhero made into the world's worst video game!
Why make a game like Superman 64? IT SUUUUUUUUUUUUUUUUX!
by This Is A fuck win March 1, 2018
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Sexual act where you ejaculate on your partner, wrap them in a red blanket, and throw them out the window.
The planet was dying, so in a last desperate act I supermaned her to give her a chance at a new life.
by Smasherly September 7, 2008
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A nickname for Bacardi 151 - in the beginning of the night you feel like you can fly, like superman, but by the end of the night you are paralyzed like Christopher Reeves.
The kids at Roger Williams all drank superman and ended up passed out at 9:30.
by RWU Crew October 29, 2006
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When a man ejaculates over the sholder blades of his sexual partner, then quickly places the linen sheet over the sholder blades on his cum, goal is that the linen sheet sticks on the sholders. Now when the sexual partner gets up, he/she has a superman cape. JUST AMAZING AND MAGICAL :)
Omg, Daniel supermaned Caroline last night. She still has her cape on. :)
by PandaPanda1982 June 27, 2018
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