Shovel Hands is a derrogatory name given to a person (usually male) with notably large and indelicate hands. Shovel Hands is the opposite of Piano Hands...which is only used to describe those with large, but delicate, hands.
Shovel Hands could, for example, be used to describe the hands of Lennie in Steinbeck's 'Of Mice and Men'
Where you have to give someone something but you don't want too. So,when you put it in there hand you push it back much more than is necessary to show that you resent doing it.