I can get white on smash they like "who, what ?"
I got enough bars to lock up the whole klu klux

from Cash Sinatra, w/ Mel, F.L.O.W. & Fame – Oldie Freestyle Lyrics on Rap Genius

Meaning

Initially Cash uses a drug reference “white on smash"
But then flips it to actually saying he has enough "bars” (raps) to incarcerate the entire Klu Klux Klan (Whit on smash)

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