British & Australian, American to be awkward with your hands and keep making mistakes.
Can you thread this needle for me? I'm all thumbs today.You know when you get nervous and you're all fingers and thumbs.
be all fingers and thumbs
To be clumsy with one's hands. Primarily heard in UK, Australia. Tom could never be a surgeon—he's all fingers and thumbs.Can you sew this button on for me? I'm all fingers and thumbs.
be all fingers and thumbs
be clumsy or awkward in your actions. British informal
In the mid 16th century this idea was expressed in the form each finger is a thumb. All thumbs developed in the 19th century as an expression indicating a complete lack of dexterity.