Bitch niggas go behind yo back like nun-chucks and that's fucked up

from Lil Wayne (Ft. 2 Chainz) – Rich As Fuck Lyrics on Rap Genius

Meaning

In this line Wayne could either be referring to:

Regardless

Wayne made a clever comparison of people placing nun-chucks behind their back

To people who talk behind one-another’s back to show that people run their mouths.

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