A ratskin generally refers to a person who is displaying rat-like qualities. The term can refer to a person who is acting stingy, odd, confusing, or a person who is being short-tempered in a manner that is laughable to those observing.
It is also sometimes used as an endearing greeting.
Romany Gypsy town, Rocky, New Close, The Dust, Phipps bridge, Redskin Village....
If your brave enough to venture through there past the caravans and teepees you will probably be scalped and robbed. At night they send out a raiding party on horses. A lawless part of London/Surrey.