Effacée means "erased" or "deleted." It's a poignant word that captures the central theme of the song: the desire to forget and move on from painful relationships.
M. Pokora uses this word repeatedly to express the act of trying to erase someone from his memory, whether it's a former lover or a friend. It's a powerful and relatable emotion, making the word particularly impactful in the context of the lyrics.
Two breakups happen in this song, and M. Pokora answers both the same way: he walks off and hits delete. First it's a lover. "On s'est dit amor, on s'est mit d'accord" (We said "amor," we agreed), and then "Une erreur et puis, d'amants à ennemis" (One mistake and then, from lovers to enemies). Everything flips "en une nuit" (in one night).
In the second verse it's his best friend: "Une erreur et puis, de frère à ennemi" (One mistake and then, from brother to enemy), and the reason fits in one line, "Tout ça pour une fille" (All that for a girl). Each time he climbs up to look at "l'horizon depuis les hauteurs de la vallée" (the horizon from the heights of the valley) and promises to think of everyone "sauf à toi" (except you). The chorus is the mantra he repeats until it sticks: "Je l'ai effacée, vite oubliée" (I erased her, quickly forgotten). The bridge shrugs it off with "Si tu veux mon avis, c'est la vie" (If you want my opinion, that's life) and "On s'aime, on s'efface" (We love each other, we erase each other).
Good phrases to steal: "Pour moi t'es nada" (To me you're nothing) and "écouter tes salades" (listen to your nonsense), where salades, literally "salads", is slang for lies or tall tales.