Cuz I'm ballin'
I'm ballin', I'm ballin'
I be countin' them stacks
Crackin' cards, get back
I gets me a big check
And everything designer but it's mismatch

from Chief Keef – Ballin' Lyrics on Rap Genius

Meaning

He making lots of money. He just be counting stacks of money. Cracking cards is like a scam to get money by cracking someones credit card code using a certain method. When he gets a big check he spends it all on designer clothes and it’s mismatch like trus, Gucci belt, Jordans etc.

Cracking cards is when you cash a fake check with someone debit card. He’s saying if you cracking cards get back, he doesnt have time for that petty shit, hes getting real checks

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