noun: (idiomatic, humorous, informal, also attributively) 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.
verb: 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”) [(transitive, humorous, informal) 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.]
