Mexicasian is derived from the words mexican and caucasian, mexi meaning mexican and casian meaning caucasion. A mexicasian (mexi-casian)is a mexican who looks like a caucasian because they have light skin and are not very knowledgeable of latino culture and spanish pronunciation and speaking it. They are mexicans who are white/american washed.
Oh my god that girl has Jarritos. Jarritos is a mexican drink. Jarritos is not pronounced Jar-rit-os. It is a mexican word so it is pronounced differently. For starters it is not said with a j, it is said with an h. So if a mexican doesn't pronounce it the way it is pronounced and says it in english, he is a mexicasian.