Your 'Arnold' is your male 'soul mate' or perfect match as defined by a relative who thinks they know exactly what you want in a partner. When you finally find your Arnold, you'll live happily ever after!
Definition was provided by loving and eccentric Aunt who believes that Arnold Schwarzenegger is ever girls dream guy and cannot understand how anyone could want anything else.
Aunt Mary : "You know... you gotta put yourself out there girl!"
"You're gonna date some bad boys but eventually you're gonna find Your 'Arnold'!"