Updating the list in OP only with stuff that I have really seen multiple characters using semi-regularly.
I love both 'rinth specific slang and the peculiar way certain Highborn class members speak, but they don't strike me as suitable for this list. I think we should be aiming here for common slang that would be used and understood nearly universally. I think most of the location/culture specific lingo is easy enough to pick up once you know the basics.
Anyone in Allanak will know rinthi slang if they're smart. At the very least be familiar with it.
I think you're drastically overestimating the degree of cultural unity between northside and southside Allanak.
Some Allanakis might
think they understand rinth slang, in the same way a suburban white pothead in high school
thinks he understands "da ghetto," when in fact the slang he thinks he knows is probably decades old, out of fashion, and misused. And Allanak doesn't have Rinthi Entertainment Television or rinthi bards running around to popularize their slang.
The entire point of in-group slang is that it's exactly that--in-group. If an Allanaki commoner has a legitimate reason to know contemporary, up-to-date rinth slang, they should have no problem learning it IC (since that's the only way they can learn it anyway). They shouldn't be pretending they understand everything when they spy on rinthers just because they read it in a GDB thread or helpfile, especially when we're talking about terminology that is specifically intended to be misleading.
