Whenever I come across it, I think "this person wanted to say something smarter than they could, so they dressed it up in smart-speak".
Saving the next person who also didn’t know what turgid meant a Google search:
Turgid (adjective) - swollen and distended or congested - (of language or style) tediously pompous or bombastic
That sounds like it conveyed the meaning perfectly: they wanted to present an idea that struck you as smart, but which you didn't understand -- we're meant to see the show as Morty, not Rick. So we just get a Rick-ism that clearly has some structure to how the Ricks are organized (which the Ricks understand), but which doesn't immediately mean anything more to us. Rick and Morty isn't a science lecture -- we should expect narrative language, not scientific language.
It suggests that the Ricks are organized around some central, finite core of Rick-ness that we don't know about (notice that they have worse lives as they acquire letter variations on their curve numbers, eg TV personalities on the citadel). That's the point -- they don't want to get into a detail physics argument about it, but frame a (later revealed) structure among the Ricks.
I just don't think we should assume that structure is the shell of a normal distribution instead of something Fry-esque (ie, I'm-my-own-grandfather shit) -- we should leave them the room to insert whatever structure fits narrative-wise when we get to the point that makes sense in the story.
I'm happy you noticed my reference there, and give you full liberty to feel any which way you may about it.
We don't really know what it is at the core, and so these girls could very well be the human "central finite curve", and not "off" it in any sense.
I was suggesting we not project our biases onto things like "central finite curve", eg that it's a curve which embodies "normalcy", until we see what role they actually play in the story.
Do you mean anything in particular for this, or are you appropriating a TV show phrase to mean "unusual"?
(Just pointing out that the 'central finite curve' is something that has meaning to Ricks but isn't really a stand in for 'usual' in any meaningful sense in the context of the TV show -- I'd hate for what's potentially a cool sci-fi idea to turn into a euphemism for "the shell of a high dimensional normal distribution".)