Chad is a slang term for a type of young man. In the 2000s, it was used in Chicago as a derogatory description for young, upper-class, urban males. In modern internet slang, the term generally refers to a masculine white male, that being an "alpha" or simply a sexually successful male.
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Sources: Wikipédia. Visual rights: Visuel génératif AURA — aucune photo de la personne.