Yes. Almost always.

As a kid, we wanted to obscure what we said from the adults or at least make them stop listening (there was a phase when I was in school of including a speech impediment when speaking; we found that teachers didn't listen to us after a little while.).

We'd either done something the adults had forbidden or were about to, something that would cause us embarrassment if the adults knew, or it was just more exciting if they didn't know.

As the adults catch on to what things mean, we all using those terms in that specific way.

I'm using 'adults' to mean someone who is responsible for themselves so somewhere between eighteen and thirty.

If you're an adult reading this in the UK and US (maybe other places), urban dictionary is your friend.

One big thing I notice is that the youngest speakers all use [ɹ̈] for "r", instead of the more traditional [ɹ], which means it's formed in the back of the mouth now. I have to think that will change the trajectory of the whole phonology going forwards if it holds up, since dropping front-of-the-mouth r is a major tendency English has had.

Use of "like" as a hedge is the most famous change for young speakers all over the Anglosphere. It's just handy, honestly, to have a quick way of conveying degrees of certainty in this highly complicated world. If future English grew that into a full mood system it would actually be great. At the other end, the last vestiges of grammatical gender have been on their way out for centuries, and are leaving at an accelerated rate now.

I think young people are much more comfortable verbing nouns than older generations. English is noted for doing this, but usually the words that can be used either way are fixed. In the absence of a better verb I'll often improvise one, and be understood no problem by speakers my age, but I've never heard an older speaker do this.

The audio frequency goes down with age 😇

Some of the American English words used by young people sounds confusing, but are just abbreviations: "riz" for charisma.

Others, I don't know where they came from: "yeet" to mean throw.

Am American and I think the kids seem to like coming up with words that are random and nonsensical? Like I still don’t know what this “skibidi” word means lol not sure I want to know xD