My recollection is that Sigma male was originally a joke to belittle people that really believed in that bad-wolf-study idea of Alpha and Beta males. Shortly after taking "alpha male" seriously became a meme, listicles and memes started popping up about the secret, even more powerful Sigma variant. Since it has truly no basis in science, I figured sigma was a joke pull from either Six Sigma or maybe even the villain from Megaman X. Now I'm curious if research will find anything on the origins, I need to do some digging.

Anyway, it all gets immediately much funnier when Ligma males come onto the scene shortly after.