codeword

a word or phrase shared by a group which has a special meaning to that group codewords are often used to hide meaning or intention from anyone not in the group groups that use codewords extensively include commies, racists, teens, politicians, military, conservatives, cops, criminals, drug dealers, gangs, lawyers, geeks, and spies contrast "codeword" with "shibboleth", which is a word that identifies you as belonging to a particular group but doesn't have any special meaning