a batman
A batman is when you hide in your uncle’s closet and watch him screw your cousin. You wear a bat suit and beat your junk like it’s a punching bag and yell 'I’M BATMAN!' right before you blow load.
'I did a batman and I scared my cousin so bad she cried.'
'My cousin did a batman on me and I got a wedgie.'
'I did a batman and my uncle said I was a weirdo.'