Meanings
From the idea that a finger that is too fat or large is likely to accidentally press one or more keys other than the intended one.
A supposed cause of typographical errors, especially keyboard errors that cause erroneous trades to be executed in financial markets, or typing errors on touchscreen devices.
Alternative form of fat-finger (“to type (something) erroneously on a keyboard, keypad, or touchscreen by accidentally pressing with a finger one or more keys other than the intended one”)
