The TikTok Tunnel Girl meme features Kala, a content creator known as @engineer.everything, who went viral for documenting her ambitious DIY project of digging a massive tunnel system beneath her suburban home. The saga captivated the internet throughout late 2023 as she shared videos of herself hauling dirt, mixing concrete, and installing structural supports. The meme typically revolves around themes of intense hyper-fixation, the 'feminine urge' to start an unnecessarily complex task, or hiding an eccentric life from the outside world. It is used to represent anyone who is deeply committed to a niche, perhaps questionable, project that consumes their time and energy.