The word rascaste is the preterite form of rascar in the second person singular. There are other translations for this conjugation.
See the full rascar conjugation
En realidad, creo que apenas rascaste la superficie.
Well, actually, I think you barely scratched the surface.
Es por eso que me rascaste en la mejilla.
That's what you just scratched on my cheek.
Te rascaste la oreja.
You just scratched your ear.
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