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An analogy to keeping something secret. Or for keeping something dark or quiet.
Gandalf: Is it secret, is it safe?
Frodo: just like a black cat in a coal cupboard!

Employee 1: Who knows about the promotions?
Employee 2: Noone, they are keeping is as black as a black cat in a coal cupboard!
by Charcoal44 May 20, 2011
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