The clip is linked to Théorus, whose short French line j'suis en slip has been shared as a reaction sound among French speaking meme users. The phrase literally announces that the speaker is in his underwear, so it quickly became shorthand for being caught exposed or unready. Short voice lines like this spread because they need no context and can be pasted into gaming clips, chats and edits. Its popularity comes from that instant recognition, with the awkward image arriving as soon as the words are heard.