Fat-finger meaning

Accidentally pressing the wrong key on a keyboard and entering an erroneous command that causes a serious problem. The term harks back to the very early days when computers were instructed to perform operations by flipping switches on the console.
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A supposed cause of typographical errors.
noun
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(informal) To make errors in typing on a keyboard or keypad by accidentally striking more than one key simultaneously with one finger.
verb
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Origin of fat-finger

  • fat + finger, the implication being that a person who fat-fingers does so because his or her fingers are too fat to strike a key without accidentally simultaneously striking a neighboring key.

    From Wiktionary

  • From the implication that a finger that is too fat (“big") is likely to strike a key in addition to or other than the intended one.

    From Wiktionary