I've been making a post-apoc survival adventure game lately [1], and as part of the world-making I've spent some time on banging out little slang languages and cultural terms, for the characters in it to use. They deal in English, mostly. But so much time has past, and theres been so much loss of the traditional institutions which "anchor" languages over the decades and actively help to keep them consistent, that there cant help but be LOTS of drift, here and there. Linguistic mutation and evolution -- but survival of the "most popular." Of whatever gets most repeated, person to person.
Its also a comedy so I get to have fun playing around with the distinction between "Approved, Proper and Official" languages and words, and their nemeses: the hip, the veil-piercing, the casual, the quickly improvised or intentionally irreverant ones.
When I was a kid I could effortlessly switch back and forth between the two types. Though I felt more natural and at home in the latter. Then as a groan-up in the white-collar workforce, when I was forced to do the whole hours-long, two--way highway commute M-F to spend yet another 8 hours in a drab cubicle, and had to Watch Every Single Thing I Said and Did All Day Long lest some random person take it out-of-context or Find It Offensive, a certain joy for life was... slowly beaten out of me.
I've always been a fan of Lojban, on paper. But I dont see it having a bigger future. English is "good enough" however imperfect.
Less is more strikes again? :-)
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(1. see my bio: Slartboz)