beja, slengheda, can we get a trigedasleng word for "cruel"? Slakkru came up with jofri several years back, but that feels dated now.
Maybe just krul? The english word does have a certain pithiness that feels apt.
I like dista from "sadistic".
Re: references, what matters is how much they were relevant at the time of the Second Dawn. Now, having said that, it's 2023, and, you're right, Joffrey isn't a household name anymore, so he logically wouldn't be in 2042, so yeah, it doesn't make as much sense. But it does make sense for there to be frozen cultural references from the 2040s (i.e. things that would've still been relevant and discussed in the 2040s). Some of that will be stuff from our era, and some of it will be future stuff we have no knowledge of yet—or can make up.
Thanks for asking! It's fun to come up with stuff for Trig., and I'd really like to keep doing it—as well as incorporating community vocab., and putting out new versions of the Trig. document. And expand the wiki!