“No mames” is a slang phrase in Spanish which is used to mean “no way” or “you’re kidding me,” but with a crude connotation, similar to “no f—ing way” in English.

Google Translate shows it as being more vulgar:

In the meantime, the Liberty phone seems to be the closest option for a US-made smartphone. While not entirely comprised of US-sourced components, the PCBs are manufactured in California, as well as device packaging and assembly.

April 10 update: Right on time, the author of the OP’s linked article has now published an article on the Liberty phone.

If anyone remembers the Mycroft Mark II Voice Assistant Kickstarter and was disappointed when development challenges and patent trolls caused the company’s untimely demise, know that hope is not lost for a FOSS/OSHW voice assistant insulated from Big Tech…

FAQ: OVOS, Neon, and the Future of the Mycroft Voice Assistant

Disclaimer: I do not represent any of these organizations in any way; I just believe in their mission and wish them all the success in getting there by spreading the word.