Local yoof dialect is even worse, where people within around a 20 mile radius speak a lingo apparently all of their own.
Been a while since I worked with such people, and although some of them were really good people, the lingo kind of did my noggin in.
An example that springs to mind was the repeated use of "bare". As in "Bare people in Morrisons today!" Which apparently means a lot. The word must have been really "in" at that time, considering that it was used at almost every possible opportunity! Interestingly only one person was flying the flag for this lingo, but he was the type that suited it.
I've just seen that apparently it's not a localised thing, but I've never heard any British youth from outside my area say that. Mind you I don't listen to much youth speak, in my area, let alone in other places, if I can possibly help it.
There was one guy turned up for a group interview that I was attending that was so full of all this 'new fangled young persons language' that I suddenly felt really ancient and out of touch, and although it was possible to guess the gist of what he was saying, it's really amazing how fast language evolves. I wonder if he formalised his speach during the interview, following the informal group chat.
Lose touch wih young people for 10-20 years and you're going to feel like you're a total alien, even more so than normal!
One phrase I find much more annoying is the repeated use of "Legit" at every opportunity. Like "She legit had a good reason to do that." This tended to be used by those seemingly trying hard to be heard to be using "in" words, apparently in an effort to impress others. Not sure how that's supposed to work.....
These things really grate when people over the age of 30 or so, try to use them. It's like "No, leave that stuff to the kids you fool!" imo at least.......