The study is about the interpretation of spoken French built on themes: coded message, relative, delinquency, hospitality, meeting, corruption, superstition, syntax, phonetics, etc. which give some ideas of a double set of sociolinguistic and cultural context of words and expressions in French. By applying the variational and systemic approaches, it is possible to explain why language changes in meaning from one part of the world to another. It is hoped that this study will permit non Chadians to understand what could be described as “specific French” spoken in Chad compared with “global French” which is known as standard French.