Oseille is a French slang term for "money" or "cash". While it literally means "sorrel" (a type of herb), in this context, it's a very common and informal way to refer to money.
In the song, Luidji repeatedly uses the phrase "La famille avant l'oseille, l'oseille avant les salopes" (Family before money, money before bitches). This highlights a hierarchy of values, making "oseille" a central and recurring theme in the lyrics, representing the material wealth that is prioritized after family.
Luidji's "Foufoune Palace" is a blunt, almost boastful look into a fast-paced, hedonistic lifestyle. He's all about quick encounters and moving on, as he says, "On s'est texté, j'vais la sexer, puis la nexter illico" [We texted, I'm going to sex her, then next her immediately]. He's constantly on the go, juggling work and multiple women, even mentioning seeing "une autre une autre une autre" [another, another, another] tomorrow night.
Despite the wild nights, Luidji makes it clear where his priorities lie: "La famille avant l'oseille, l'oseille avant les salopes" [Family before money, money before bitches]. It's a funny, almost contradictory statement that shows a glimpse of what truly matters to him amidst the chaos. He's swimming in women, or as he puts it, "J'nage dans les foufounes, marée haute, marée basse" [I'm swimming in pussies, high tide, low tide], but he's also focused on his career, wanting to "sortir des bons disques" [release good records]. It's a wild ride through his world, full of blunt observations and a clear hierarchy of what's important.