FOMO - Fear of missing out.
For me, it was actually this year. I actually looked for a $pepe coin around January, because of my love for Pepe Lore memes and couldn’t find anything. Now I missed out on a meme coin of a lifetime.
FOMO is usually affecting new people in the crypto space because we often see new people in crypto just want a quick profit from altcoins that's why many pump and dump altcoins almost like 100% in a day or within a few hours. If you missed out $PEPE then you can always look for other altcoins with your own research, don't easily fall to FOMO because an altcoin become trending.