Place it right after the shameless act in your edit, then follow it with Oh My God Wow and Nelson's Ha-Ha! so the sequence moves from the callout to a bigger reaction.
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Sem Vergonha is a short spoken Portuguese exclamation, lasting just under four seconds, used as a direct reaction to shameless behaviour. The phrase itself does the calling out, turning a moment of cheeky behaviour into something everyone can point at. It feels indignant and playful at once, like catching someone in the act and naming it out loud for everyone nearby to hear.