The word rascaba is the imperfect form of rascar in the first person singular. There are other translations for this conjugation.
See the full rascar conjugation

rascar

Ya sabes, me rascaba hasta Hasta que no podía jugar más.
You know, I scratched it up till it couldn't play anymore.
Ya sabe, me sentaba en su regazo y me rascaba la espalda.
You know, I'd sit on her lap and she'd scratch my back.
Y luego me sentaba y me rascaba bien.
And then I'd sit down, have a good scratch.
Ya lo noté cuando se rascaba la pierna y no sentí nada.
I figured that when he scratched his leg and I felt nothing.
Ella vomitaba, y por qué siempre se rascaba?
She threw up, and why did she always scratch herself?
He perdido una uña, ¿me rascaba en algún sitio?
I lost a fingernail, I must have scratched somewhere.
¡He oído como rascaba en la pared!
I heard him scratching on the wall.
Y se sentaba en un sillón y yo le rascaba la espalda.
And I'd sit on the back of the couch, and I'd scratch his back.
El cantante rascaba el guayo mientras cantaba.
The singer scraped the guayo as he sang.
La segunda vez, me rascaba un poco más fuerte y un poco de sangrado
The second time I scratched harder. It started to bleed.
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