Definition of Tex-Mex adjective from the Oxford Advanced Learner's Dictionary

 

Tex-Mex

 adjective
adjective
BrE BrE//ˌteks ˈmeks//
 
; NAmE NAmE//ˌteks ˈmeks//
 
[only before noun] Styles of music
 
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connected with the variety of Mexican cooking, music, etc. that is found in Texas and the SW part of the US a Tex-Mex restaurant See related entries: Styles of music Word Origin 1940s: blend of Texan and Mexican.
See the Oxford Advanced American Dictionary entry: Tex-Mex