In this comment, the person is expressing that they are experiencing lag while watching your video. They mention seeing a link and then encountering the lag, which they find amusing (lmao is a common abbreviation for "laughing my off"). They also express their intention to subscribe to your channel for no specific reason.
What's lag?
Lag refers to a delay or slowdown in the performance of an online video, game, or any other media content. It typically occurs when there is a delay between the user's actions and the response of the content due to issues like slow internet connection, network congestion, or device performance. The delay can result in choppy video playback, unresponsive controls, or other disruptions in the viewing or gaming experience.