Plebada is a colloquial term, particularly common in Mexico, for a group of friends, a crew, or a gang. It's a more informal and regional word than common alternatives like "amigos" or "grupo."
In the context of this song, the line "En Culiacán con la plebada yo ando al cien" ("In Culiacán with the crew I'm at a hundred") uses the word to show pride and belonging to a tight-knit group. It's a word that instantly places the song in a specific regional, street-level culture.
Get ready to cruise with Luis R Conriquez and El Rabbanito in "Todo Bien"! This song is all about living the good life, Mexican corrido style. Luis R tells us right away that he's been spotted "muy cerquita de Durango" [very close to Durango], and he's growing some seriously "apestosa" [stinky] weed. And why not? It's selling everywhere, even in Los Angeles!
He's gone from a skateboard to an AMG, rocking "Ropa Amiri, LV" [Amiri, LV clothes] while cruising the LA freeways. Everything's good, "Todo bien." He's also moving product across the border, making money, and hanging out "en Culiacán con la plebada" [in Culiacán with the crew], where he's "al cien" [at 100% or doing great]. He's testing out his Porsche Coupe and AMG, and the "Merca pa' vender" [merchandise to sell] comes from LA. It's a fun, boastful look at success and the fast life.