TikTok pasta refers to viral pasta recipes from TikTok, especially the 2020 feta pasta but also chopped sandwich variants and others. Not concerning, just food. If your kid uses it constantly, ask them where they first heard it, not to police their speech but to understand which online community they are in. Most slang of this kind moves through TikTok and group chats, so seeing it in your child's vocabulary just means they are plugged into normal teen internet culture.