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1.
When two people hate each other for no reason other than to hate each other, or when people talk behind each other's backs, or when people get in stupid fights just to get into a stupid fight.

See drama.
Mike: Charlie really hates you, doesn't he?
Jim: Yeah for sure.
Mike: Why?
Jim: Just some stupid dark business.
by Kyle R P October 08, 2006
4 0
 
2.
Shady activity. Something secretive and no good.
Anything from spreading gossip to dealing drugs.
Nothing good will come of it.
Bob: Hey, Jamie's really been acting weird these days.
Jonny: Yeah. I think he's up to some dark business that he's not telling us about.
by shaniqua2 November 02, 2006
4 2