The deep, dark depression one sinks into upon finishing the fifth Harry Potter book. The mood is characterized by a feeling of intense loss, loneliness, and hopelessness. Essentially, there is a deep black chasm somewhere near the heart.
Concerned Friend: What's wrong with Ted? Has he been crying?!
Wise Friend: He's fell into Sirius Blackness. I'll give him some chocolate.
by yumfudge July 26, 2011

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