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1.
Describes something that is probably above average, but is trying a bit too hard to be more than it really is.

Generally used to describe restaurants. The phrase originates from the practice, frequently deployed by establishments that fall into this category, of replacing a white table napkin with a black one for customers with darker clothing.
The food was actually quite good, but the restaurant was a bit black napkin.
by Telebev November 03, 2009