tostaste
-you toasted
The word tostaste is the preterite form of tostar in the second person singular. There are other translations for this conjugation.
See the full tostar conjugation

tostar

¿Quieres decir que tostaste a uno de los buenos con esa cosa?
You mean, you toasted one of them goody-goods with that thing? Wicked.
Sí que tostaste a ese hombre.
You really toasted that guy.
Tostaste tu piel al sol, por eso ahora la tienes ardiendo.
Your skin sunburned, that's why it's so hot now.
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