You can't stand you won't last
You ain't ballin' like I am
And I stay countin' stacks
I'm ballin' like a gym

from Chief Keef – Got Them Bands Lyrics on Rap Genius

Meaning

Gyms are the places where basketball games are played. In hip-hop, the comparison between ballin' in a basketball game, and ballin' (showing off your riches) is very commonplace.

Keef uses this metaphor to (yet again) show off how many stacks he has. See Kobe for more examples of this

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