Put it at the end of a setup where a request is made, then follow it with a reaction sound that answers the refusal, such as Bruh, so the exchange reads as a complete joke rather than a single line.
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This is a brief Portuguese voice clip built around the line “Não sou de fazer”, lasting just under two seconds. The words themselves do the work: a plain refusal from someone who will not take on the task being suggested. It feels dry, dismissive and stubborn, the kind of answer that closes a request without an argument or an excuse.