The phrase references the prospect of running a virtual machine environment, specifically VirtualBox, on Apple’s mobile operating system. Virtual machines allow users to operate different operating systems within their existing environment. For example, one might desire to run a Linux distribution inside of iOS.
The appeal stems from the ability to access applications and operating systems not natively supported by iOS. This functionality could unlock access to a broader range of software tools and development environments, circumventing the limitations imposed by Apple’s curated ecosystem. However, current technical and licensing constraints pose significant challenges to its realization.