Beli-bélica is a unique and playful neologism created by Belinda, combining her nickname "Beli" with the word "bélica" (warlike or belligerent).
In the context of the song, it's a self-referential and empowering declaration, suggesting a fierce and strong persona. It's a memorable and intriguing word because it's a personal stamp from the artist, making it unique to her and this song.
Belinda's "Aries" is a super relatable song about the messy feelings that come with a breakup, especially when pride gets in the way. Our singer is clearly hurting, spending nights wondering about her ex and even admitting to stalking them online, saying, "Ya parezco LEIU, me tienes aquí stalkeándote" [I already look like LEIU, you have me here stalking you]. She's feeling a "chingo de ansiedad aquí en el pecho" [a lot of anxiety here in my chest] and calls it "La cruda del amor, siempre la peor" [The hangover of love, always the worst].
She points out their zodiac signs, "Yo tan Leo y tú tan Aries" [I'm such a Leo and you're such an Aries], suggesting they're both fiery and stubborn, which led to everything going wrong: "Tanto fuego y todo valió madre" [So much fire and everything went to hell]. The real villain here is pride, "Este fucking orgullo que separó mis besos de los tuyos" [This fucking pride that separated my kisses from yours]. Even though it hurts, she's trying to move on, even if it means crying to sad songs and dancing with other people she doesn't really want to kiss. It's a raw look at the struggle to let go when you're still holding on.