It means an awkward or inept way of doing something; originally meaning left handed, stemming from cultures that use their right hand to eat and their left hand to wipe their behind.
That shelf you put up looks a bit cack handed
von The Acid Drop Kid 19. Oktober 2007
Someone who is cackhanded is lefthanded, and hence a clumsy fool who can't write or use a knife and fork properly.
My sister is cackhanded. It's really annoying because you can never find righthanded scissors in the house despite the fact that 3/4 of my family are righthanded. I'm sure she chucks them away as a result of her bitter twisted resentment of the fact she's not normal.
von RH Rule 15. August 2006