When I sucked your dick, it's like smokin' a roach

from The Notorious B.I.G. (Ft. Lil Kim) – Another Lyrics on Rap Genius

Meaning

The roach is the very end of a blunt (Zig-Zag joints back then).
Since it is so small it’s difficult to hold without burning your fingers.

Fat niggas are notorious for being small below the gut, maybe that’s why they call him Biggie Smalls.

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