Little is known about the original recording behind Estoy en teras, and it circulates mainly as a short soundboard clip rather than as a widely documented meme with a clear source. Its appeal comes from the phrase itself, which sounds like a fragment of everyday Spanish speech and is easy to reuse out of context. Creators pick it up for reaction videos and short-form edits because it is brief, distinctive, and instantly repeatable. That combination keeps it in rotation for jokes about confusion, surprise, and moments that need a quick spoken punchline.