An individual that may on the outside appear normal, enjoys kinky sex. Generally though, they are identified by their "goth" appearance. A murder tramp can be male or female, but the term is more commonly used to discribe a dominatrix or domina.
He may look innocent, but damn, in the bedroom, he is a total murder tramp.
Someone who enjoys watching or causing the suffering of others.
Smashing that kids birthday cake was something only a murder tramp would do