When you type to fast and what you mean to type comes out as gibberish.
Alternatively, when one hand is off position by one key on the keyboard and you wind up typing gibberish.
"U webt ti tge nakk tidat."
"What?"
"Sorry I had gibberfingers."
---
"I wanted to know if you wanatsad to go to the movies tonight."
"Typing too fast?"
"Yeah, I have gibberfingers."