Indiocumentado 

Typically one that sells out once he/she achieves legal status in the U.S. Someone who got their green card or became a citizen and is no longer down to march on Cesar Chavez day or is too good to speak Spanish. They usually have nopales on their forehead.

Me: "Have you talked to Juan?"
Jose: "Not since he changed his name to John"
Me: "Oh, I had forgotten that ever since he became a legal resident he's become an INDIOCUMENTADO"
Jose: "Figures, he was always a sellout..."
me: "he still smells like chorizo..."

Indiocumentado by elpachucomiguel April 22, 2013