That fairy tale ending with a knight in shining armor
She can be my sleeping beauty, I'm gon' put her in a coma (Woo!)

from Katy Perry (Ft. Juicy J) – Dark Horse Lyrics on Rap Genius

Meaning

This was probably meant to mean that sex with him would be so great that the she would turn into sleeping beauty because she would be so worn out.

Worryingly though, it sounds a bit like Juicy might drug his “sleeping beauty” into a coma in order to sleep with her.

Rick Ross made the same joke in U.O.E.N.O and got in a lot of trouble, including losing his Reebok deal.

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