interior Mexican UK /ɪnˌtɪəɹɪə ˈmɛksɪk(ə)n/US /ɪnˌtɪɹiəɹ ˈmɛksək(ə)n/ adjective1 •(US) Especially of cuisine: of or pertaining to the country Mexico itself, in contrast to Tex-Mex (“a mix of Texan and Mexican”).Tony likes eating at interior Mexican restaurants because they put white cheese on their tacos, and not yellow cheese.