A medical term used to describe when an extrodinary woman leaves you speechless.
Ben: You always ignore me when I call you.
Brittany: Ya well you never leave a message
Brittany: Ya you've been brain ninja'd !
when your in a horrible "relationshit" and you get in a fight one day and the girlfriend happens to say a comment that will seem at first like the worst come back ever but soon will make you so friggin' angry that you go make a ass out of yourself in front of her
yeah steve i completely was fucking brain ninja'd, i walked in and just sounded like a complete dumm shit