Top Definition
A holiday exactly two months after Valentine's. Also known as Single's Awareness Day. Single people(usually teenagers) wear black.
"Did you know Black Day's tommorow?"
"Why? You single?"
by Jordyann April 04, 2008
1 more definition
Characterized by hostility or angry discontent for a specific, characteristic period in one's lifetime.
"Hey what's wrong with Bubba?"

"blackdays man, blackdays"

"He'll come around one day"

"yeah the sooner the better!"
by -Orang3 January 16, 2012

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