Lingua franca: the de facto language within a specialized field.
Argot: the informal specialized vocabulary from a particular field of study. Victor Hugo (Les Misérables): “What is argot; properly speaking? Argot is the language of misery.” Bruce Sterling (a futurist): “argot is a super-specialized geek cult language that has no traction in the real world.” (thank you wikipedia)
You might initially think that a cycling idiom is just a matter of throwing in the odd French/Latin word. Sure, it’s easy enough to drop rendezvous, en route, alpe d’huez, presque vu into conversation, but there is so much more.
Here is a first attempt to curate the argot of the Xmas Epic lingua franca.