A hand resembling the hoove of animals(mostly cows) but also the hand of a human. Also used to describe people that can't grasp hold of objects well, and they tend to slip out. The hoovehand is a very atrocious sight.
Guy: This is a rare sight of the "hoovehand".
Guy: Calvin has such hoovehands, you can't trust him with fragile stuff. Tsk tsk tsk.