But I ain't tryna do no dumb shit, chasin' my tail in a circle

from Meek Mill (Ft. John Legend, Nas & Rick Ross) – Maybach Curtains Lyrics on Rap Genius

Meaning

Some dogs try chase their own tails not knowing it is connected to them & nearly impossible to catch. NaS is Simply saying is refraining from doing something dumb and he proceeds to smart decisions

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