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The distinct face made when bringing up subjects of a questionable nature or thinking about them without meaning to.

dirty and/or creepy at times

also used to describe a state of being

and usually followed by a comment like "get your mind out of the gutter!"
After sharing the story about lasts nights adventure, a blissful mysterious nastiness face suddenly appeared upon his face!!
by u.know.u.love.me10 November 12, 2007

Words related to blissful mysterious nastiness

creepy dark alleys/ parking garages dirty not normal sex