Bock auf is a hugely popular German slang phrase that means "to be in the mood for" or "to fancy" something. It's the kind of authentic phrase you'll hear constantly in real-life conversations but might not find in a textbook.
In the song, the girl "hat Bock auf Shopping" (is in the mood for shopping), setting a casual, modern tone before she sees the boy on the train. Learning this phrase is a perfect way to make your German sound more natural and fluent.
Have you ever sat across from a total stranger on the train, locked eyes, and convinced yourself they were your soulmate—only to sit in dead silence until one of you walked away forever? That is the exact missed connection German hip-hop artist CRO brings to life in "Bye Bye". On a warm, sunny train ride home, a guy spots a gorgeous woman taking a seat next to him and panics internally, silently begging himself: "Sprich sie an" ("Talk to her"). He is convinced she is "das Schönste was du je gesehen hast" ("the most beautiful thing you've ever seen"), but stage fright wins. He freezes up, calls himself a "Versager" ("loser" or "failure") because his head is full of words yet nothing comes out, and he can only listen to his own racing heartbeat.
The genius twist comes in the second verse when CRO flips the perspective entirely to her side. After paying a steep €4.70 train ticket ("Vier siebzig für die Fahrt ist ja ganz schön hart") to go shopping for a bikini and a bag, she sits next to him on purpose because she finds him cute. She is having the exact same internal meltdown, thinking "Bitte, bitte, bitte, bitte komm, sprich mich an" ("Please, please, please, please come on, talk to me") and ready to accept literally anything he says. Neither person makes a move, so the moment ends with her stepping off the train and waving goodbye to the "Liebe des Lebens" ("love of my life") they will probably never see again. It is a painfully relatable, funny look at how overthinking ruins the simplest romantic moments before they even start.