In my dictionary, Rebbish, is someone who has learned Torah and Chassidus and has a personality to be able to teach people and influence them in the ways of the Baal Shem.
It does NOT mean, someone who wears a colourful bekitche in the week, with a white scarf, schtrokkes (one of my newly learned words, it means the velvet patches on the collars and cuffs) and a silver topped stick.
Maybe your dictionary was printed 500 years ago. It certainly is not a current copy.