Rochao' is a colloquial term, likely a shortened or regional slang for "rocheado," which comes from "roche." While not a standard dictionary word, "roche" in some Latin American contexts can refer to shame or embarrassment.
In the song, the artist sings, "Me tienes rochao', pensando solo en ti, nada más." This implies he's feeling embarrassed or perhaps even a bit obsessed and flustered by his inability to stop thinking about the person, highlighting a raw and relatable emotion in a unique, informal way.
Lenny Tavárez is taking us on a late-night journey through heartbreak and regret in "MENTÍ." He's out jangueando [hanging out], trying to forget an ex, but it's not working. He sees all her stories pass by and even alcohol fails him, making him think maybe el hijo de puta fui yo [I was the son of a b*tch].
He's totally rochao' [obsessed], stuck on her, and can't stop thinking about all their TBTs (Throwback Thursdays). He mentí si te dije que los borré [lied if I told you I deleted them] and can't get the memories out of his head. He's out dancing with other people, but he's really just soñando a tu lado [dreaming of being by your side]. He's hoping for another chance, saying tú me dices, yo le llego [you tell me, I'll be there]. It's a super relatable track about trying to move on but being completely stuck on someone.