An alteration of a compound string of words joining "Mexican / I / Can." Basically means that Mexicans are hard working people who will never give you up and always just do it.
Boss: Paublo, go clean the gutter.
Paublo: Mexicanican!
Boss: Paublo, degunk the garbage disposal.
Paublo: Mexicanican!
Boss: Paublo, get my wife warmed up with foreplay so she's ready for me.
Paublo: Mexicanican!
When male Mexican only gets off on Asian chicks (or guys). Depending on the person, he may eventually screw enough Asians (or never get any) that his condition worsens and starts speaking strange Asian-sounding words, such as: "Bing-bong-boy," "Chink," and "Konichiwa."
Efrain (MexiAsian Obsession victim): "¿Quieres mierda unos a otros de los sesos?" (Do you want to fuck each other's brains out?)