Inaudito translates to "unheard of" or "unprecedented". It's a strong and less common word that immediately grabs attention, suggesting something truly out of the ordinary.
In the song, the lyric "Inaudito fuera que yo siguiera amándote así" means "It would be unheard of for me to keep loving you like this." The singer uses it to emphasize the absurdity and unacceptability of continuing to love someone who treats them poorly, highlighting a turning point in their emotional state.
This song, "Me Tomas Y Me Dejas" by Luis Alberto Posada, is a classic tale of a lover who's had enough of being strung along! Our singer is absolutely fed up with his partner's inconsistent behavior. He sings, "Inaudito fuera que yo siguiera amándote así / Se acabaría mi orgullo y de seguro sería infeliz" [It would be unheard of for me to keep loving you like this / My pride would be gone and I would surely be unhappy]. He feels his heart is being hurt and tormented by their on-again, off-again way of showing affection.
He's tired of giving his all for nothing, especially after finding out that all the dreams he had with this person might be lost. The singer can't understand how his partner calls what they have "love" when all he gets are excuses every time he tries to make plans. He bluntly states, "Me tomas me dejas como si fuera tan poquito" [You take me, you leave me as if I were so little]. He sees through the excuses like "Que estas indispuesta, también muy enferma" [That you're indisposed, also very sick] and declares he's not willing to play this game anymore, even though he admits he's been a "tonto" [fool] for dropping everything to see them.