Slang about those who think by cutting corners and using shortcuts in getting rich faster by dealing drugs. It is a judgmental sentence as he judges their way as futile and dead-end, while he is hoping for a greater future as he has planned and dreamed it correctly.
You will not get anything in life further than what that scale would bring to you, while I have chosen to achieve my future through correct planing and approach.

"ya\'ll never gon\' get none beyond that triple beam dreams of yours, but I have way bigger plans."