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!
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".