It refers to a day so bad that other words don't do it justice in describing it. Usually some kind of tragedy has occured. Originated from the movie of the same name starring Spencer Tracy.
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A lot. here's a partial list: Men in Black, Pitch Black, Pirates of the Caribbean: The Curse of the Black Pearl, Black Hawk Down, Meet Joe Black, Black Snake Moan, Black Rain, The Black Dahlia, Bad Day at Black Rock, Diary of a Mad Black Woman, The Black Hole, The Black Stallion, Black Narcissus, Little Black Book, The Black Cauldron, White Hunter Black Heart, Black and White, Black Widow.
Men in Black Black Hawk Down Meet Joe Black Pitch Black The Black Dahlia Black Snake Moan Black Rain Diary of a Mad Black Woman The Black Stallion Black Knight Black Robe Bad Day at Black Rock Black Christmas The Black Hole Black Sheep Little Black Book Creature from the Black Lagoon Fade to Black Black Sunday Black Moon Rising Source:imbd.com
Faster.
yes
It may mean that she is having a bad day or she is really upset about something that happened.