The word rascó is the preterite form of rascar in the third person singular.
See the full rascar conjugation

rascar

Al mismo tiempo se rascó por debajo de la sábana.
At the same time, she scratched herself under the comforter.
Tal vez llegó allí cuando me rascó la espalda.
Maybe it got there when she scratched my back.
Se encogió de hombros y se rascó con las llaves.
He just shrugs and scratches himself with his keys.
Mi padre rascó su bolsillo y puso esto en su mano.
Dad reached in his pocket and handed this to him.
Ni siquiera se parece a la mente cuando se rascó detrás de las orejas.
He didn't even seem to mind when I scratched him behind the ears.
Se cayó al suelo y se rascó el...
She'd roll on the grass and tickle her...
Quería que alguien le dijera lo que debía regalarCarlitos se rascó la cabeza, preocupado.
He wanted someone to tell him what he should give his dad. Charlie scratched his head, worried.
Oye, amante, ¿alguna mujer que sepa de verdad cómo hacerlo, te rascó la espalda alguna vez?
Hey, lover, you ever had your back scratched by a woman who really knows how?
Luego rascó el interior de la cabeza y sacudió los restos en un cucurucho de papel encerado.
Then he scraped the interior of the head and shook the results into a cone of wax paper.
Rascó las orejas de Musha y se inclinó hacia ella, tocando su frente con la suya.
He scratched Musha on the ears and leaned in close to her, touching his forehead to hers.
Es la última vez que me rasco el sobaco en público.
That's the last time I ever scratch my armpit in public.
Mira, mira, yo le rasco, convertirlo en un zombi.
Look, look, I scratch him, turn him into a zombie.
A mi gato le gusta cuando le rasco tras las orejas.
My cat likes it when I scratch her behind the ears.
Tú me rascas la espalda, y yo rasco la tuya.
You scratch my back and I'll scratch yours.
¿Está bien si me rasco la nariz?
Is it okay if I scratch my nose?
Si lo rasco, lo hago detrás de la oreja.
If I scratch him, I scratch him behind his ear.
¿Qué dices si rasco tu espalda y tú la mía?
So what do you say I scratch your back and you scratch mine?
Es decir, Ud. me rasca la espalda, yo rasco la suya.
I mean, you scratch my back, I'll scratch yours.
Tú me rascas la espalda, y yo rasco la tuya.
You scratch my back and I'll scratch yours.
Tú me rascas la espalda... y yo te rasco la tuya.
You scratch my back and I'll scratch yours.
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