A person who takes pleasure from recieving sexual pain, and who also takes pleasure out of giving sexual pain. This type of pain may include, but is not limited to: biting, scratching, etc. A sado-masochist enjoys pain, just like any other form of stimulation.
She, being a sado-masochist, couldn't help but be aroused from the sudden pain of his bite, and proceeded to dig her fingernails hard into his back.
The combination of sadism and masochism, in particular the deriving of pleasure, especially sexual gratification, from inflicting or submitting to physical or emotional abuse.
The state in which a person can only think of disturbing instances to provide entertainment or a sensual pleasure in. Very strange defect in very strange people.
Dammit paco, you must have Satomasochisticismism because you laugh at horror movies and look at harlequin babies to make yourself happy.