Pichear is a colloquial term, especially common in some Latin American countries, that means "to ditch" or "to blow off" something or someone. It implies intentionally skipping an activity or ignoring a person.
In the song, the artist sings, "Hoy voy a pichear el PlayStation, eso es de una / Pa' ir a verte con la combi Ecko, las trenzas y el durag." He's saying he's going to ditch playing PlayStation immediately to go see his love interest, highlighting his eagerness and the importance of seeing her over other activities.
"POR SI MAÑANA NO ESTOY" ("In Case I'm Not Here Tomorrow") is Omar Courtz writing to an ex he can't quite let go of. He opens missing her at night, then slides into specific memories: a moon tattoo on her ankle, borrowing his dad's car to go pick her up, a song he wrote just for her that she never showed up to hear.
The chorus turns the song itself into a kind of insurance policy. He's making the track "in case I'm not here tomorrow," so if he ever disappears, she'll have something that says nobody will love her the way he did. It reads less like a breakup song and more like a love letter written against the fear of being forgotten.
Along the way he name-checks 2016, Maybach Music and Ozuna, grounding the relationship in a specific time and place: house parties, skipping school for PlayStation, her dad in the next room. By the end he's back at the beach alone, hoping to run into her again and wishing her well either way.