chupaste
-you sucked
The word chupaste is the preterite form of chupar in the second person singular. There are other translations for this conjugation.
See the full chupar conjugation

chupar

No, eso significa que se la chupaste.
No, that means you blew him.
Realmente disfruté la última vez que me chupaste. Hagámoslo de nuevo.
I really enjoyed the last time you ate me. Let's do it again.
No, eso significa que se la chupaste.
No, that means you blew him.
Parece que tu novio no puede recordar... si se la chupaste bien o no.
Seems like your boyfriend can't remember whether or not you give good head.
No, que se la chupaste.
No, that means you blew him.
¿Lo chupaste?
Maybe you licked it?
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