"NetHunter is [an] Android penetration testing platform for Nexus devices built on top of Kali Linux, which includes some special and unique features. Of course, you have all the usual Kali tools in NetHunter as well as the ability to get a full VNC session from your phone to a graphical Kali chroot."
So basically, it is a super mobile Kali Linux platform built specifically for Nexus devices with pre-programmed attacks. And before I leave you all to have a look about for yourselves, there are some key things that you should know.
"Kali NetHunter runs within a chroot environment on the Android device so, for example, if you start an SSH server via an Android application, your SSH connection would connect to Android and not Kali Linux. This applies to all network services."
"When configuring payloads, the IP address field is the IP address of the system where you want the shell to return to. Depending on your scenario, you may want this address to be something other than the NetHunter."
"Due to the fact that the Android device is rooted, Kali NetHunter has access to all hardware, allowing you to connect USB devices such as wireless NICs directly to Kali using an OTG cable."
I've watched a couple of the videos, one of which was a USB MitM, and I think it's really cool. So go ahead, check it out. And if you have one of the newer Nexus devices, install it and tell us all what you think.