to jerk off on a girl's back while she is sleeping, on her stomach. and then suddenly wake her and have her roll over. once she stands up the blanket will be stuck to her back resembling the cape of superman.
i supaman that hoe last night she didn't realize until i left.
by brian a November 12, 2007
an after sex prank, where the guy allows the girl to fall asleep (usually on her stomach), he then ejaculates on her back and covers her with a sheet, allowing it to attach to her back like a cape.
Ayo, after I nut, imma supaman that hoe like YUUUUUUUA!!!
by Nahmeen November 23, 2007