what does this mean?

If you experience numbness in your fingers it could be a circulatory problem.

Also some neurological problems that could cause you to lose control of your limbs.

If you work in extreme conditions there is a problem know as "White Hand" caused by a reaction to severe vibration.

Depression can also distract you from the task at hand resulting in forgetting to hold on to stuff.

Best to see a doctor and get it checked out.

Depends on your age.

If your very young it means your limbs and joints are growing.

If you are aged then you are going senile.

Anywhere in between and your drunk.

Depends on your age. Teen years, you're still growing. It COULD also just mean you're clumsy.

Get medical advice!

i get this, dont know why, just happens, and i am a glazier

it means you should hold things tighter.

you need to get more sleep..