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
¿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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