Escrachándose comes from the verb escracharse, which means to expose oneself, to make a fool of oneself, or to be publicly shamed. It's a word with a strong social connotation, often used in Latin America to describe public protests or denunciations.
In the song, Eladio Carrion uses it to highlight how his detractors are
Eladio Carrión and Myke Towers spend three minutes proving they've made it, using name brands as the scorecard. The hook keeps it plain — "Everything Foreign / M-O-N-E-Y" — before Eladio opens his verse ranking one designer label over another the way a rapper used to rank cars: "Esto no es Kith, lil na, esto es Vetements" [this ain't Kith, lil na, this is Vetements].
Myke Towers takes the back half and turns the boasting into an origin story. He remembers being counted out — "Cuando estaba en cero me subestimaban" [When I was at zero they underestimated me] — and answers it with the line that gives the song its swagger, "Nosotros somos reye' desde chamaquito', ¿oíste?" [We've been kings since we were kids, you hear?], closing the song exactly where it started: on top, and used to it.