-they scratched
The word rascaron is the preterite form of rascar in the third person plural.
See the full rascar conjugation


¿Ves dónde se rascaron la espalda en el árbol?
See where they scratched their backs on the tree?
Bueno, ¿sus ancestros no se rascaron para conseguir que?
Well, you know what our ancestors itched for?
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