Maligne (or malin for masculine) literally means 'sly' or 'cunning'. It's an interesting word because it's not as common as other adjectives and carries a specific nuance of playful mischief or cleverness, often with a hint of manipulation.
In the song, the phrase "Fais ta maligne" (or "Fais ton malin") is used repeatedly. It's an idiomatic expression that means "Don't play coy" or "Stop acting all high and mighty/clever." The singer is telling someone to drop their pretentious or overly confident act, making it a very engaging and context-rich word to learn.
"Fais Ta Maligne" is RIDSA's playful back-and-forth with someone who's clearly showing off for the camera. He calls her out directly: "Es-tu belle sans ton filtre?" [Are you pretty without your filter?] and "Dès que tu me vois tu me filmes" [The second you see me, you're filming]. The whole song sits in that gap between how she performs online and who she actually is. The title is the joke itself: she's "Fais ta maligne" [playing smart] and he's "Fais ton malin" [playing cool] right back, two people posturing at each other, neither one backing down.
He's not really angry about it, more amused. "Ce soir on sort" [Tonight we're going out] repeats through the chorus like a dare rather than a threat. By the end though, he's had enough of the act: "Arrête ton cinéma" [Stop the theatrics], he says, "Tu parles mais tu ne fais rien" [you talk but you don't do anything], the one line where he actually means it. Calling someone's bluff, without raising his voice.