USB On-The-Go (OTG) is the spec that allows mobile devices like smartphones and tablets with USB ports to act as a host for accessories like flash drives or keyboards. It's how you're able to plug in a wired Xbox controller to a tablet like the Nexus 7 and play supported Android games. USB OTG requires a supported male-to-female adapter cable, which Monoprice sells for $1.50. But if you need one immediately, Make has a quick and dirty guide to splicing your own using a male micro B cable and a USB extension cable. Rewiring and soldering isn't as easy and clicking a buy button, but it's a good way to learn how these cables work. Related from the Tested archives: how to patch and repair your Ethernet cables.