When you interface with any kind of computer that requires manual input (whether by keyboard, or a touch screen) there is the chance for making a mistake. Such mistakes are playfully called "Fat Finger Disease".

我們在操作需要手工輸入的電腦(不管是鍵盤還是觸摸屏)時，總難免會出錯。這些手工輸入時犯的錯誤就被戲稱為“胖手指病”。

Fat finger here refers to the act of performing a typo, often used when referring to password typos.

這里的“胖手指”指的是輸入錯誤，通常用來指密碼輸入錯誤。

For example:

You didn’t get my email? I must have fat fingered the address.

你沒收到我的郵件嗎?我一定是輸錯地址了。