Getting beat up, or jumped, by a group of niggers.
After Joe made a racist joke at KFC, he soon drew a crowd and was blacked up on the spot. His friends claimed they never knew Joe in order to avoid being blacked up.
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An act of aggression that occurs "when fools need a beating, and you call your homies, and put in some work."
If you don't get yo' hands off my bitch, I'm callin' for black-up.
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A Secondary plan that is either very sketchy or requires questionable methods
"oh hey dude how are you gonna do that"-Person 1
"im switching to my Black-up Plan"-Person 2
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A black up plan can only be observed.
"What the hell, you're 2 weeks pregnant?!? Where's my boxing gloves."
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The so-called art of repairing something in a half-arsed manor, much like black people do because they are so lazy.
Dude: you totally fixed my TV!
Dude 2: no I just blacked it up by using a wire coat hanger as an aerial.
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A phrase used to show support for a African American. Generally this phrase is used to show support of a black person largely based upon his or her race, but not always. This phrase is often used to show support of the first black president of the United States, Barack Obama, and his policy of "Change."
Me: Obama is gunna change everything!
Josh: Yeah we gotta Black Him Up! Gotta get my vote in!