mamaste
-you suckled
The word mamaste is the preterite form of mamar in the second person singular. There are other translations for this conjugation.
See the full mamar conjugation

mamar

Se lo mamaste a De Souza también, ¿verdad?
You blew De Souza, too, didn't you?
Tu solo se la mamaste a ese tipo.
You just blew that guy.
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