Mon frère is French for "my brother," but it's commonly used in German hip-hop and youth slang as a term of address for a close friend or associate, similar to "bro" or "mate" in English.
In this song, the artist uses it to address a complex relationship, hinting at betrayal and conflict despite the initial term of endearment. This blend of languages and its specific usage in a rap context make it an interesting and culturally relevant word to learn.
This song, "F20" by LACAZETTE, is a really intense look at an inner conflict, almost like a battle with himself. He talks about a strained relationship, saying "Dass wir miteinander reden, ist schon lange her" [It's been a long time since we talked to each other]. It feels like he's wrestling with a part of himself that's manipulative and destructive, describing it as a devil whispering in his head: "Du dringst in meinen Kopf und flüsterst wie ein Teufel" [You penetrate my head and whisper like a devil].
There's a constant push and pull between wanting to break free and still feeling a connection. He says, "Ab heute sind wir keine Freunde" [As of today, we are no longer friends], but then admits, "Lass die Waffe runter, eigentlich mag ich ihn noch" [Put the weapon down, I actually still like him]. It's like he's fighting against his own dark side, acknowledging they share a heart but not the same mind: "Wir teilen dasselbe Herz, aber nicht dieselben Köpfe" [We share the same heart, but not the same heads]. The title "F20" refers to a diagnostic code for schizophrenia, which really drives home the idea of this internal struggle and the feeling of being haunted by another version of himself, even seeing "Lacazette" in the mirror, but also "Arther Fleck" – a reference to the Joker.