Interesting article in the Oxford Dictionaries Blog on terms for left-handers:
Used to refer to something of, on, or towards the left-hand side of the body (and is Latin for left). It also gave rise to the rather uncomplimentary adjective sinistrous: left-handed, slow.
1940s Australian slang term for someone left-handed. Molly being a pet form of Mary, Dooker most likely comes from duke, a slang term for fists (especially raised for fighting).
Katy-handed and Kay-nieved
From the English counties Cheshire and Lancashire, kay-nieved comes from the Danish keite, ‘left’, and the early Scandinavian nieve (a clenched hand or fist; the hand used to grip a sword or an oar).
In baseball, a southpaw is a left-handed pitcher. This comes from the orientation of the diamond to the same points of the compass, causing the pitcher to have his left hand on the south side of his body. Also used for a left-handed boxer who leads with their right hand.
Surfing with your right foot forward instead of your left (also skateboarding).
From the North East of England, origin unknown. (also used in the East End of London and was allocated to LHC organiser Keith as his golf tour nickname!).
See the full article here:
See our full article on Left Handed Language