And ya'll know all my money straight (It's straight)
Like a motherfucking perm (No perm)

from Meek Mill (Ft. Cory Gunz, French Montana & Mase) – Right Now Lyrics on Rap Genius

Meaning

Hair perms are used to chemically straighten your hair.
To be straight is like being good or content. If Meek says his money is straight, he’s good and definitely not hurting.

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