A person who sucks the social life out of a social interaction.
Etymology: From physics, where a blackbody is a solid from which no radiation reflects or escapes, black holes are the most familiar example. From optics, commonly implemented as a black velvet lined box with a small window, from which no projected light escapes. Conceptually similar to [heatsink] (thermodynamics) and ground (electronics). Coined in early 1980s by Cindy and Jaime.
Synonym: [Emotional Vampire], coined by [Andrzej]

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