É mentirinha is a short Portuguese phrase that has circulated online as a reaction sound, prized for its compact, teasing way of labelling something as only a little lie. Rather than coming from a widely documented film or television moment, it is shared in the same way as many short phrase clips, passed between creators who need a fast, lighthearted response to exaggeration. Its brevity makes it easy to drop into memes, edits and chat replies, and its playful tone keeps it useful long after the first joke, because calling out a small fib never goes out of style.