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Dirty K: (noun) - A thousand dollar; (grand, rack, stack, K) that has been acquired illegally, most commonly through the sell and (or) distribution of narcotics.
Guy: Aye man, you got the money wit' you?
Real nigga: Yea my nigga, you know I keep a dirty K wit' me.
by NOTtheplug October 13, 2016
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