"Unblock Tube" typically refers to accessing video-sharing websites (like YouTube) that have been restricted by a network administrator (e.g., at school, work, or in a specific country). The following information is for educational purposes only. Always comply with your local laws and your organization's acceptable use policy. What Does "Unblock Tube" Mean? "Tube" is internet slang for video platforms, most famously YouTube (the name implying a "tube" for watching broadcasts). "Unblock Tube" therefore means bypassing network filters, firewalls, or geo-restrictions to access video content that is otherwise inaccessible.