Maldades is the plural of maldad (wickedness), and it translates to "wicked deeds" or more playfully, "mischiefs". It's a fantastic word that perfectly captures the song's core theme of being a 'Mala Santa' (Bad Saint).
In the lyrics, Becky G sings "Apaguen celulares, estamos para maldades" (Turn off your cell phones, we're here for some mischief). She's using the word to describe a night of rebellious, playful fun, rather than anything truly evil, making it a memorable and expressive word to learn.
Becky G completely throws out the good-girl image here. Right from the hook, she warns everyone that she is not easily labeled: "No soy ni mala ni santa" (I'm neither bad nor a saint). She is out at the club to drink, dance, and live on her own terms without romantic drama. When she sings "No me hablen de amor, eso a mí no me interesa" (Don't talk to me about love, that doesn't interest me), she is setting a hard boundary. She takes charge of the flirtation instead of waiting around for someone else to make a move.
The energy in the track is all about staying out until morning and causing a bit of trouble. She asks for tequila to wet her throat, grabs her dance partner by the waist, and commands everyone to "Apaguen celulares, estamos para maldades" (Turn off your cell phones, we're here for mischief). In Spanish, maldades literally means "wicked deeds" or "evils," but on a Latin dancefloor, it just means being wild and breaking a few rules without leaving any digital evidence behind. She admits she might seem quiet at first (calladita), but once the night kicks off, she has no intention of stopping.