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It is the behavior of keeping something a secret or held in confidence. Often used as an adjective to describe information being exchanged that is to be held in confidence.

The term orginates from the idea that once something has entered a black hole, it cannot escape.

The "w" is silent.
Al: So you let her in your office? What did she want?
Bill: Yeah, I did-- and this is blackwholism, ok?
Al: Of course!
Bill: She wanted me to use a CIGAR!
Al: WHAT?! At least it's biodegradable.
by drewplaysdrums December 30, 2010
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