I bury the most cash and burning the rest
Ross is saving (“burying” like pirates did in pre-bank days) most of his cash and spending (“burning”) the money he isn’t saving. This is also a metaphor for “burning” weed, in accordance with the last few lines.
Like the Cocaine Cowboy Jon Roberts from Miami who had so much cash he buried it in his backyard.
To help improve the meaning of these lyrics, visit "I'm On One" by Drake (Ft. DJ Khaled, Lil Wayne & Rick Ross) Lyrics and leave a comment on the lyrics box