butterfingers

Short definition from Wiktionary

Noun

1. 1
   Someone who tends to drop things; (more generally) someone who is clumsy or uncoordinated; a klutz.
2. 2
   One's fingers which tend to drop things, or are clumsy or uncoordinated.
3. 3
   A tendency to drop things, or to be clumsy or uncoordinated.