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

rascar

Tuviste un accidente de tránsito mientras rascabas tu nariz?
Get into a car accident while picking your nose?
Tú me rascabas la espalda, y yo te decía cuándo cortarte los pelos de las orejas.
You scratched my back, and I told you when it was time to trim your ear hairs.
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