1. Sleeping with someone after you go on a dinner date with them.
2. Any post-coital meal.
Maleri: How did your date go last night?
Veronica: It was hot. Callum and I grabbed some sex mex.
by Verbal Platinum Princess April 25, 2009
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Half sex, half Mex. Having sex, not finishing, then splitting a burrito.
1. "No, him and I aren't going out. We just meet up and sex-mex sometimes."

2. "Hey bro, did you fuck that babe the other night?"

"We only sex-mex'd... but that burrito was dank!"
by SymbolicChameleon January 27, 2016
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When you have been away from Tex-Mex for so that you actually orgasm from eating a good plate of Tex-Mex.
"OH MY GOD! I've been away so long that I just had Sex-Mex after eating those Fajitas!"
by Servoisgod April 17, 2008
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Having wild hot sex then going to get a big mexican dinner after.
William and I had crazy sex. I wore my sombrero because I knew we were going to muchachos after for mex. Sex and mex has become a sexy routine.
by Sex and mex August 4, 2017
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Having sex with a person from Texas who is mexican. This word is particularly used for an attractive mexican female.
A: I'm going to Texas next week! Gonna meet a mexican Girl.

B: Make sure to have lots of Tex-Mex-Sex!!
by LeeSinToMe March 7, 2014
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