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1.
Sophisticated hired hit man
Man, the black suits are gonna come and get you if you get out of line
by O-town Finest September 11, 2009
 
2.
the feds, FBI, CIA, DEA.
Man, I'm on the grind, but the black suits is all over my biz.
by Andrew Baggaley April 19, 2007
 
3.
To be on any drug or under the influence. From Spider-Man 3, in which the filmakers compared to the black suit to an addictive drug
Black Suit: Im in the Blak Suit with Jim; we as high as hell!
by vanillaprice July 10, 2008