Can you be down, nah, nigga C.M.B
That's cold, that ain't nice G

from Lupe Fiasco – A Bathing Harry Lyrics on Rap Genius

Meaning

This quote is from the movie New Jack City. He’s talking about G who was Neno Brown’s (Westley Snipes) partner in his gang CMB (Cash Money Brothers) Also Ice T was an undercover cop who wanted to join CMB but Neno Brown said no

C.M.B. also stands for call me back, which implies Lupe trying to avoid someone who can’t be down by telling him (insincerely) to call him up later.

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