aA"Baddenheimer" is a sexy ass girl, a baddie, that you see walking down the hall that you will never have a chance with in your life but you envision yourself putting a ring on her finger in your dreams, while in reality you fake a phone call as you walk past her so that you can avoid eye contact.
"Oh my God, Taylor is such a baddenheimer"
or, You walk past past a beautiful woman and you say to your buddy, "Baddenheimer"