heteromexual

A white person whom is attracted to Mexicans or a Mexican whom is attracted to white people

Molly: DAMNN! JAVIER IS H0T!
Fernanda: Are you serious? That muchacho won't ever fall for a gringo like you!
Molly: But he's heteromexual like me!

homomexual

A Mexican whom is attracted to other Mexicans

Alejandra: DAMMMN...ALEJANDRO ES MUY CALIENTE!
María: What's up with you and muchachos mexicanos?
Alejandra: I told you this before....soy una homomexual!