Morgengrauen literally translates to "morning grey" or "dawn". It's a more poetic and evocative word for the early morning than the more common Morgen.
In the song, the lyrics "Wir liebten uns bis zum Morgengrauen" (We loved each other until dawn) use this word to paint a romantic picture of a night spent together, emphasizing the passage of time until the very first light of day. It adds a touch of romance and imagery to the narrative.
Have you ever had a crush on someone who seemed way too cool for you? That's exactly what this song is about! The singer has been into this guy for ages, someone she describes as "zu cool ist für diese Welt" (too cool for this world). She was always too nervous to do anything about it, but then one night at a party, everything changes when he finally speaks to her.
This song is all about that one magical night that feels like a dream. They kiss, and she can hardly believe it's real. The best part? She has proof! The whole song centers on the "Selfie von heut' Nacht" (A selfie from tonight), which she sees as evidence that their connection "kein Märchen war" (wasn't a fairytale). Even though they are total opposites, like "Sonne und Mond" (sun and moon), she feels like fate brought them together. It's a super sweet story about a dream finally coming true.