WiFi Kill was an Android application (originally developed by bponury) that later evolved into popular forks like on GitHub. The premise was simple: When you connect to a public WiFi network (airport, school, library, or café), the app scans for all other connected devices. With a single tap, you could supposedly "kill" their connection, leaving you with all the bandwidth.
: More advanced 2021-era scripts often use Wi-Fi deauthentication frames. These frames are sent to the router or the device, masquerading as the other party, and command the connection to be severed. This does not require the attacker to be "man-in-the-middle" like ARP spoofing does. Popular 2021 Implementations on GitHub wifi kill github 2021
