The phrase is from the TV-show "South Park" and the so-called "Chewbacca defense".
Ladies and gentlemen of this supposed jury, you must now decide whether or not to reverse the decision for my client, Chef. I know he seems guilty, but ladies and gentlemen...
This ... is Chewbacca. Now think about that for one minute - that does not make sense. Why am I talking about Chewbacca when a man's life is on the line? Why? I'll tell you why: I don't know. It doesn't make sense. If Chewbacca does not make sense, you must acquit! Here, look at the monkey. Look at the silly monkey!
The grindset is a contemporary ideology of self-exploitation disguised as strength, deeply tied to the aesthetics of the “sigma male” and to new digital forms of patriarchy. It promotes the idea that human worth depends on productivity, economic success, absolute emotional control, and the ability to work endlessly, turning vulnerability, rest, community, and tenderness into signs of weakness. Beneath its rhetoric of discipline and power often lies a profound inability to relate healthily to pain, fragility, and human interdependence.
“That’s the grindset, brother. While weak men sleep and complain, sigma males stay disciplined, work in silence, suppress emotions, and build power while everyone else wastes time chasing comfort.”
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".