M'téma is a very interesting and modern French slang term, derived from "mater," which means to stare at or eye someone, often with a certain intensity or desire.
In the context of the song, it's used to describe the girl's persistent gaze: "La go fait que m'téma" (The girl keeps staring at me). This word is engaging because it's a common, yet informal, expression in contemporary French, making it highly relevant to understanding modern French conversations and music.
KeBlack's "Elle Fait Que M'téma" is a playful and confident track about a woman who's clearly interested, but the singer isn't going to rush into anything. He notices her constant gaze, "La go fait que m'téma" [The girl keeps looking at me], and her desire for him to "lui mette dans l'euh" [put it in her, euphemism]. But he quickly asserts his difference, "Mais c'qu'elle sait pas c'est que j'suis pas comme eux" [But what she doesn't know is that I'm not like them], suggesting he's not easily swayed.
He tells her to take it slow, "Mais vas y doucement, Faut pas m'brusquer jeune fille j'ai dis doucement" [But go easy, Don't rush me, young girl, I said easy]. KeBlack describes a sensual encounter, with lines like "Après ma main sous ta fesse ce sera à elle de décider" [After my hand under your buttock, it will be up to her to decide], hinting at a more deliberate and mutually decided progression. He's confident in his prowess, even claiming she'll "m'féliciter Pour mes prouesses et ma vivacité" [congratulate me For my prowess and my vivacity]. It's a fun, boastful song about taking control of the seduction, with a touch of humor and a lot of swagger.