It's when you kill her parents.
Yo dawg lets batman that ho
When you cum into a girl's hair, and mold the hair to have two spikes sticking out... mostly cuz you hate the bitch...
Fred: Dude, Bitch was acting up, so I decided to get my revenge...
Dude: You didn't?
Fred: oh yeah, I had to Batman that Ho!
When you cum on a chick, then get your Lousiville Slugger and whack that ho with it. If this bitch can't keep her yap shut about the whole deal, the police usually get involved.
"Dude, I spent the night in jail for Batman that Ho on Julia... then some big Black guy Spidermanned me! "
When you and your boy are fuckin a girl (aka Batman and Robin) and then you both bust in her face singing the batman and robin song
Girl "both you guys come over here and batman me..you in the front, you in the back"
Boys: Lets batman that ho by cumin on her face while singin the song