Largely, stands for kicking one's ass real bad, yet specifying one's groin area ("...your knot") for particular intensification of the utterance.
For steppin' on the stage I should rock your knot (from the '8 Mile' movie)
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"Rock your knot" means to "nod your head".
"We'll reign on your brain and rock your knot" (from Run-DMC's song "King of Rock").
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