Chapulines literally means "grasshoppers" in Spanish. It's an interesting word because it's not commonly used in everyday conversation, making it stand out.
In the context of this song, and in Mexican slang, "chapulines" refers to people who jump from one side to another, betraying loyalties for personal gain. It's a vivid metaphor for opportunistic or disloyal individuals, making it a memorable and culturally rich word to learn.
This song is a classic corrido tumbado flex, all about what happens when you suddenly get a lot of money and power. The singer, Jesús Ortiz Paz, describes a world where cash is king. He's got so much money, or "Sobran las pacas" [The stacks of money are leftover], that he can sponsor beautiful women he sees taking photos for Instagram. They're not drinking beer, it's "pura de champán" [only champagne]. It's a life of luxury, expensive brands like Louis Vuitton and Boss, and escaping the police—he even boasts, "Y de la LAPD me les pelé" [And I got away from the LAPD].
The real point of the song, though, is how people change when they see you're successful. He's blunt about it. People who used to ignore him now treat him with respect, calling him "Usted" [the formal 'you']. He gives a pretty intense example: "La morrita que antes no me contestaba / Ahora mi casa se pone a barrer" [The girl who didn't answer me before / Now she comes to my house to sweep]. He also warns about fake friends, the kind of people who "Sonríen de frente, apuñalan de atrás" [smile to your face, stab you in the back]. It's a song about enjoying the high life but keeping your eyes open for the fakes who are only there for the money.