Aiguiser means "to sharpen". While it literally refers to sharpening a physical object like a knife or a pencil, it's used metaphorically in this song.
Amel Bent sings, "À mon époque fallait aiguiser ta plume" (In my time, you had to sharpen your quill/pen). Here, "aiguiser ta plume" means to hone your writing skills, to perfect your craft, and to be ready to express yourself effectively. It evokes a sense of dedication and effort that stands in contrast to modern, more instant forms of creation.
Amel Bent and KeBlack's "Quelle Époque" is a super fun look back at how much things have changed, especially in the music industry! They're basically saying, "Hé, en vrai quelle époque" [Hey, seriously, what an era] and remembering a time before smartphones and TikTok.
Amel talks about writing lyrics on paper and dreaming of money, not just making TikTok dances. She and KeBlack are all about staying authentic, saying "On reste authentique, Ouais, ça ment pas" [We stay authentic, Yeah, that doesn't lie]. They're going to keep going "tant que le business est rentable" [as long as the business is profitable], but they're not going to compromise who they are for viral trends. It's a cool reminder to stay true to yourself, even when the world around you is constantly changing!