Childrens hoop, motor car, girlfriend
originally a gird was a hoop or bicycle wheel driven by a stick (a lot of fun), later transposed to meaning a car,( no' a bad wee gird") It is often used as an unsentimental compliment regarding a girl.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.