either someone who is shit at
being a cunt, or a cunty person who is just a
complete cunt. Every attempt at describing a shitcunt succeeds only in describing someone slightly less cunty - in essence, the infinite cunt. A contemptible cunt more cunty than you can imagine, ever.
can also be used to describe a lady suffering from rectal
incontinence, literally her cunt is shitty.
eg My neighbour, ex and daughters boyfriend are all fucking shitcunts
fancy a pint shitcunt. (this is generally considered banter)