Sigeon Pex appears online mainly as a user-labeled meme clip rather than a sound with a clearly documented mainstream source. The name itself is uncommon and likely survives because people search for the exact label they saw on a soundboard, repost, or edit. Like other odd reaction sounds, it spreads through short-form videos, compilations, and inside-joke meme pages where abrupt audio makes a scene feel stranger or funnier. Its staying power comes from that reusable randomness: even without shared backstory, the sound can instantly signal an ironic or offbeat turn.