In Scots ye can be a 'southie'.As a left-hander, I prefer the term 'sinister'. It keeps people guessing.
But also carrie-fisted, ker-haundit, katie-handit, skerrie-handit...
and south of the Border, cack-handed, cuddy-whifter, dolly-pawed...
the English Dialect Survey in the 1950s found 88 different terms