Tex-Mex Syllabification: (Tex-Mex)Pronunciation: /ˈteks ˈmeks/Definition of Tex-Mex adjective (especially of cooking and music) having a blend of Mexican and southern American features originally characteristic of the border regions of Texas and Mexico. noun 1Tex-Mex music or cooking. 2a variety of Mexican Spanish spoken in Texas. Origin: 1940s: blend of Texan and MexicanTex-Mex in other Oxford dictionaries Definition of Tex-Mex in the British & World English dictionary