My new frequency illusion is the phrase "ride or die". I'm 32 and I had never heard that in my life until I watched that show Cruel Summer and now it seems like I hear it everywhere, mostly on tv/ads/podcasts and almost never when talking to people I know. I refuse to say it because I don't fully understand what it means and when I do hear it, it always sounds a little cringey.
A Will Smith movie called ride or die came out in May and grossed $400M. Probably explains the jump in that phrase. I had heard it before but you only hear that phrase every couple years or so.