Tontito is a diminutive of tonto, meaning "silly" or "foolish." The suffix -ito adds a sense of smallness or endearment, but in this context, it's used to intensify the insult, making it sound more condescending.
In the song, Rels B uses tontito del juego to call out a rival as a "silly little one of the game" or a "dummy of the game," implying they are insignificant and foolish in the rap scene. It's a memorable and somewhat playful insult that highlights the artist's confidence and dismissiveness towards his competition.
Rels B and Lil Brailingo are not holding back in "FLAKK RIP KEO." This track is a full-on diss, with Rels B directly addressing his rivals and making it clear he's on top. He talks about how these other artists are sending him direct messages and trying to get his attention, but he's just not interested. He even says, "no es amor lo que tĂş sientes" [what you feel isn't love], implying their admiration for him isn't genuine.
Rels B flexes his success, stating, "hago mi dinero lo hago cuando quiero" [I make my money when I want to]. He dismisses his competition as "tontito del juego" [little fool of the game] and reminds them that they were fans from the start. He's so confident that he feels "pena hasta tirarte de los tontos que eres" [pity even to diss you because of how foolish you are]. He also points out their lack of success, mentioning, "te quedaste en 500.000 yo ya más de 10 millones loco y sigo su mando" [you stayed at 500,000, I'm already over 10 million, crazy, and I keep adding]. It's a blunt and direct message that he's moved far beyond them.