Matter of fact, act like I'm rapping to you
If that gives you passion to use this as an excuse
Then just jump up out of conclusion that I'm attacking you dudes
It's just like old fashion voodoo

from Tech N9ne (Ft. B.o.B & Hopsin) – Am I a Psycho? Lyrics on Rap Genius

Meaning

B.O.B. wants the people he is rapping about to jump to the conclusion that he is attacking them in this song, so they can have the passion to continue rapping and make a response song. “Old fashioned voodoo” just means that he’s manipulating them. I guess this gives B.O.B. pleasure

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