I was speaking today with the albañil. We were discussing the electrical box for the cieling. I said that I wanted it to be very strong and I used fuerte. He replied with a word that I have heard dozens of times but just focused on today. He said something like machín. I cannot find it in the dictionary so I asked my wife. She knows the word but agreed that it would not be in the dictionary.
So, anyone know how to spell it and know where or how it orginated?