The clip comes from a random YouTube video recorded and shared by a Portuguese creator collecting funny moments, with the surrounding collection tagged for Portugal, Lisbon and Porto humour. The phrase sei lá se é o chinês became the memorable part because it captures a very everyday Portuguese expression of uncertainty. Shared as a short soundboard clip, it spread among Portuguese-speaking users who reuse reaction sounds from viral videos in chats and edits. It remains popular as a quick, recognisable shorthand for not knowing and not being able to explain something odd.