Sel3a is North African Arabic slang that has crossed into French rap, especially through artists like Soolking with Algerian roots. It literally means "merchandise" or "goods", but on the street it usually points to something valuable, risky or even illegal being moved around.
In the song, the lyrics repeat "Ouais, sel3a, j'l'ai chargé en GT3" ("Yeah, the goods, I loaded them in a GT3"), using sel3a to hint at valuable cargo without ever naming exactly what it is.
"Sel3a" is a fast, confident track from Soolking's album Sans visa, featuring Marseille rapper Naps. The lyrics paint a night out: a few drinks, a Vuitton bag, a fast GT3, and a woman he calls "sel3a" - Algerian slang for someone so attractive she's basically a catch. He plays it cool, tells her he loves her, and she believes him.
Between the boasting are glimpses of home: Oran, Marrakech, listening to the rai legend Cheb Hasni, and feeling unstoppable like a Ligue 1 player. The song closes in Algerian Arabic, with lines about Algeria and being crazy in love ("na3cha9 bik"), tying the swagger back to where Soolking and Naps come from.