Contagia is the third-person form of contagiar, meaning "to spread" or "to be contagious", usually used about illnesses.
In the song, Andrés Cepeda flips the idea and says the magia (magic) between two people "se contagia", painting love as an irresistible, infectious force. This unexpected medical metaphor inside a romantic lyric makes the word memorable and fun to learn.
Ever been stuck in the friend zone while secretly crushing on someone? That is the exact tension driving "Magia" by Colombian pop artist Andrés Cepeda and Sebastián Yatra. The track opens on a confession long overdue: after countless nights of just being buddies ("Fueron tantas las noches siendo tu amigo" [It was so many nights being your friend]), the narrator can't hold back his feelings anymore. He feels an undeniable spark whenever he looks at her eyes and lips, declaring "Siento magia" [I feel magic]. To him, stumbling into her path feels like fate ("estaba escrito en mi destino" [it was written in my destiny]), and keeping quiet about it is no longer an option.
What makes the song fun is its playful honesty about shifting boundaries. The lyrics flatly state, "Ya está claro niña que no somos amigos" [It is clear, girl, that we are not friends]. They might bicker because their personalities match too well, and an accidental kiss might slip out ("un beso prohibido por error se me sale" [a forbidden kiss slips out by mistake]), but neither of them can pretend the romance isn't real anymore. Cepeda and Yatra channel that giddy, reckless stage of falling in love where denying your feelings just makes you mad ("negarlo me da rabia" [denying it makes me angry]) and you simply want to shout the truth to the world.