To have sex "doggy style" and ejaculate on her neck and roll her over the sheets....when she stands up, the sheet will have stuck to her neck like a superhero...hence superman.
In the song crank that or 'dat' by Soulja Boy they use the term "superman dat ho"
bands or singers such as Whitney Huston, Salt & Pepper, AC/DC and George Michael that perform again after a long stint off and think they still have it, tour again to raise some extra drug money for their retirement.
George Michael is all bloated and old when he came to Australia ... it's just another Superannuation Tour.