This project studies "La Movida Madrileña", a countercultural movement that took place mainly in Madrid during the Spanish transition after Francisco Franco's death in 1975, from the perspective of linguistic change. The main objective is to estimate the repercussion that this sociocultural movement had on current colloquial Spanish. We examine the persistence or regression of those lexemes and constructions innovated or taken as their own by the countercultural youth movement of the seventies, later continued with the "movidas" of other Spanish cities, which spread and were incorporated into the colloquial register. After several decades, it can be observed that those constructions met with different fates, as some were extended to all age groups, others were adopted by the new generations (tío/a as a vocative) and others have restricted their use considerably (carroza). By reviewing the impact of the idiosyncratic youth language of the countercultural movement, the aim is to shed light on the formation of colloquial Spanish, as well as the relationship between society, culture and linguistic change.