It's kinda booming round the way and today I'll make a killing
Dressin' down like a villian', but only on the block
It's a clever disguise to keep me running from the cops

from 2Pac – Str8 Ballin' Lyrics on Rap Genius

Meaning

Even now that he has become a higher-level drug dealer, 2Pac still sells on the street when it’s “booming” (more buyers than sellers, good market)

His “disguise” from the cops is the clothing of a low-level drug dealer that the cops wouldn’t even bother busting (wouldn’t “ice cream man” work better?)

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