An immigrant, or child of an immigrant, that makes sure to close the metaphorical door behind them to stop other immigrants from coming in. Some portazos reiterate xenophobic talking points about immigrants and refugees to fit it with citizens. Portazos can be ethnocentric about the original country and their new adopted country. Others just care about their new adopted country; forgetting where they came from. While the term is used for the hispanic/latin community, it isn't limited to that community.
Portazos were on Fox news talking about how this nation is being overrun with migrants who aren't the best or brightest. Meanwhile, Portazos in congress were talking about new policies making it harder for people coming in and limit rights for existing migrants.