Considered representative of "young people" and of Spoken French, the structure adj de chez adj (gris de chez gris) (similar to the English expression : adj as in adj (bad as in bad)) is all the more interesting from a strictly linguistic point of view that it is, at the very least, unexpected taking into account the syntactic constraints of French. To understand its emergence, it is necessary to look at its evolution and to understand how this construction, which initially expressed spatial localization and was strongly constrained by its governing verb and the semantics of its complement, came to allow an adjective to appear after the preposition and a semantics of intensity.