[fat-fing-ger] Informal.
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  to make a mistake by pressing the wrong key on a keyboard or number pad
2.  to make an error that causes further problems

Collins English Dictionary - Complete & Unabridged 10th Edition
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