Pichear is a popular Puerto Rican slang verb meaning "to ignore" or "to brush someone off." It's a fantastic example of Spanglish, as it's believed to come from the English baseball term "to pitch," as in pitching something away from you.
In the song, Bad Bunny says the woman "siempre pichea', menos si el perreo llama" (she always ignores everyone, unless the 'perreo' calls). This word perfectly captures her cool, untouchable attitude and is key to understanding the modern, slang-filled language of reggaetón.
In "La Corriente," Bad Bunny and Tony Dize team up to describe a woman who is completely captivating because she lives life on her own terms. She's not like anyone else: "Porque tú no eres como otras, no / Tú eres diferente" (Because you're not like the others, no / You are different). She does exactly what she wants, always going "en contra de la corriente" (against the current). This isn't a bad thing; it's what makes her so attractive. She ignores most people, but she'll always show up for a good party, or as Bad Bunny puts it, "menos si el perreo llama" (unless the perreo calls).
This woman is confident, independent, and knows her own worth. She recently got out of a relationship and is thriving now that she's single, with no one telling her what to do. She's the star of her own show, or as the lyrics say, "ella es la película" (she is the movie). The singers are so drawn to her energy that they're willing to get swept away. Bad Bunny makes it clear with the line, "Si tú fueras una ola / Pues que me lleve la corriente" (If you were a wave / Then let the current take me). It's a fun, flirty song celebrating a woman who refuses to be anything but herself.