Dirty money come with lots of stains
Road to riches come with lots of lanes

from Kendrick Lamar (Ft. Gunplay) – Cartoon & Cereal Lyrics on Rap Genius

Meaning

This pun on “dirty” (ill-gotten) money and the metaphoric road to riches (various means of success) is likely a shout-out to this classic number

Going back to his theme about karma, dirty money (illegal work/fast money) comes with lots of stains, as in doing this illegal activity to obtain fast money comes with alot of blemishes in your life because karma will catch up to those bad acts. “Road to riches comes with lots of lanes” relating to the previous line, Riches can be obtained alot of ways legally and illegally

Double entendre on the first line of the couplet. Money that is literally dirty/unclean will come with stains on it. Dirty money gained by nefarious deeds will come with a price and stain your soul.

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