Side eye is a visual meme that travelled from everyday body language into short-form video, where a sideways glance became shorthand for suspicion, disbelief and quiet judgement. On meme videos and reaction edits, creators began pairing that look with short stings and sound effects so the joke landed even without dialogue. The format spread because it is instantly readable across languages and contexts, needing no explanation for viewers to understand the reaction. It remains popular as a quick, reusable punchline for calling out awkward, shady or unbelievable moments in everyday content.