The word "Siatonto" is a colloquial and somewhat aggressive term that combines "si" (yes) with "tonto" (fool or idiot). It's used to emphatically call someone foolish or stupid.
In the context of the song, it's used as a taunt or an exclamation, often directed at other men who might be upset about the singer's interactions with women. It captures a defiant and provocative tone, making it a memorable and unique piece of slang within the lyrics.
The whole song runs on two Costa Rican slang words most Spanish courses will never teach you. A wila is a girl, a mae is a guy, and 4bes uses them to keep score: "Una wila más que reportó" (another girl who checked in) on one side, "Otro mae más que se va a mosquear" (another guy who is going to get annoyed) on the other. That is the entire plot. He is counting.
The bragging is blunt to the point of comedy. "Usted cuide la suya porque si no me le monto" (look after yours, because otherwise I am getting on her) arrives in the formal usted, which makes a threat to steal your girlfriend sound like advice from a bank teller. He promises "Su novio no se va a enterar" (your boyfriend is never going to find out) and then spends two minutes telling everyone. The hook itself, "Sia-sia-siatonto", is not really a word at all, just a tag he chants until it sticks.
4bes crafts music that often features compelling rhythms and a clear vocal delivery. Their sound can feel quite direct, focusing on strong melodies that stick with you.