Genitorture: Torture of the genitals
Good pain: Good pain and bad pain are terms used lightheartedly by BDSM practitioners, signifying that whilst BDSM may include an element (often quite pronounced) of consensual pain, there is a purpose to it, and some pain is consented to and accepted whilst other pain is not. "Good pain" is therefore pain that is mutually agreed, desired or permitted by the submissive partner to be experienced, and seen by them as of enjoyment or value.
Golden showers: Urinating on, or being urinated on by, another person.
Gorean: A BDSM sub-genre based upon the rituals and practices created within the world of Gor in the erotic novels by John Norman.
Gunplay: The practice of including actual (or simulated) firearms into a scene.
Handkerchief codes: visible signs to indicate to others your area of BDSM interest
Hard limits: What someone absolutely will not do, usually non-negotiable.
Harem: A group of subs serving one or more Dom/mes.
Impact play: Part of sensation play, dealing with impact such as whips and riding crops.
Infantilism: Parent/child or parent/baby role playing.
Knife play: Slow, methodical sensation of the bottom with the edges and points of knives, usually without cutting the skin. Fear of the weapon plays a large part in the stimulus of the bottom.
Limits: What someone "won't" do or is hesitant to do
Masochism: Act of receiving pain for sensual/sexual pleasure.
Masochist: Person who enjoys pain, usually sexually.
Meat slap: the act of hitting or slapping a partner with the penis in a demeaning manner.
Mollywop / Molliwop: the act of hitting or slapping a partner with the penis in a demeaning manner.
Mummification: Immobilising the body by wrapping it up, usually with multiple layers of tight thin plastic sheeting. Breathing and other safety measures must be appropriately taken care of, often by leaving the face (or at least the mouth and nose) open. Body temperature (maintained to an extent by movement) may also be affected so a warm environment and warm aftercare may be important. Mummification is often used to enhance a feeling of total bodily helplessness, and incorporated with sensation play.
Munch: A group of people that are into BDSM meeting at a vanilla place. Sometimes this is a club. You might see an announcement like, "This weekend's munch is at Denny's"
Needle play: Temporary piercings done with sterile needles of varying gauges, usually only for the duration of a scene.
Newbie: Someone new to BDSM.
OTK: Over the knee (spanking). Continued