noting or pertaining to errors made by hitting the wrong key or button on a keyboard, keypad, or number pad: fat-finger dialing errors; a large number of typos evidencing the fat-finger syndrome.
verb (used with object)
to make an error
in or on (something) by hitting the wrong key or button: I must have fat-fingered my username. You can easily fat-finger the tiny keyboard on this device.
2000–05; so called from using the thumb to type, or accidentally hitting two keys with one finger