Finger-spaz 

A random spaz in your finger, while you are on your computer. This is what you get when you play too many computer games.

Sorry, I had a finger-spaz!

Finger-spaz by Nidajazz April 28, 2011

spaz finger 

The moment when a finger does an involuntary movement that results in an unwanted outcome

Whilst trying for the perfect tee shot, an outbreak of Spaz Finger meant the ball did not land as expected

spaz finger by Dredded Joe August 23, 2017