Romanticizing in current slang means deliberately framing ordinary moments as beautiful and meaningful. "Romanticize your morning" = drink coffee like you're in a French film. Not concerning, often a positive mindfulness practice. 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.