Bobos is a colloquial term for minor aches, pains, or injuries, similar to "boo-boos" in English. It's an interesting word because it's informal and often used in a tender or slightly childish context.
In the song, the lyric "Quand c'est trop tard, c'est la raison qui soigne tous les bobos" (When it's too late, it's reason that heals all the boo-boos) uses bobos metaphorically. It refers to the emotional hurts and wounds caused by following one's heart blindly, which reason then has to mend.
Have you ever felt completely torn between your head and your heart? In "Le Cœur Ou La Raison," French-Algerian singer Lynda explores this classic dilemma, but she describes it as a full-on personality clash inside her.
First, she lets her heart take over. She calls it a fool who "fonce tout droit comme un imbécile" (rushes straight ahead like an idiot). This heart is a hopeless romantic who believes in movie-style love, forgets all its past wounds, and gets completely addicted when it falls for someone. It's so intense that it becomes "aveugle, il efface tous les défauts" (blind, it erases all the flaws). But when things go wrong, it's her logical side that has to step in and "soigne tous les bobos" (heal all the boo-boos).
Then, she gives her reason a chance to speak. Reason is the complete opposite. It's cautious, strong, and always thinks about the future to avoid mistakes. It knows its own worth and acts as a security guard for the heart. But the song's big struggle is that she can't pick a side. She sings, "Faut qu'j'me décide et ça fait mal" (I have to decide and it hurts), admitting that choosing between following her feelings or her logic is a choice she feels she's just not capable of making.