Fuoristrada literally translates to "off-road" and refers to an off-road vehicle or SUV. It's a specific and somewhat luxurious item that stands out in the lyrics.
In the song, ANNA raps, "Sembro americana sopra un fuoristrada" (I look American in an SUV), associating herself with a powerful, stylish image often linked to American culture and success. This word adds a touch of aspirational glamour and a specific visual to her persona.
BENIHANA is two minutes of ANNA counting what she has and enjoying how much that annoys everyone else. The chorus is close to a shopping list: "Dammi i soldi, dammi pure la fama" (Give me the money, give me the fame too), "Guarda i miei follow, guarda che folla" (Look at my followers, look at that crowd), and then the pettiest line on the record, "Si prendono male se non lascio la collab" (They get upset if I don't give them the collab). Somebody is always asking her for something, and she has stopped pretending to mind saying no.
The title only lands in the last verse. Benihana is the teppanyaki chain where the chef cooks on a hot plate in front of you, so "Metto questi rapper sulla brace tipo Benihana" (I put these rappers on the grill like Benihana) is a threat and a joke at the same time. The line right before it is where the whole pose comes from: "Da bambina volevo esser come Rihanna" (As a little girl I wanted to be like Rihanna). ANNA keeps rewinding to that girl, "Ero solamente quella quindicenne" (I was only that fifteen year old girl), then cutting back to now, where she is in a Defender and has no patience for a boyfriend, because "questi tipi sono tutti fuori" (these guys are all out of their minds).