Her nigga behind me right now asking for ass and shit
And I'mma need that 40 dollars even if I gotta
Fuck, suck and swallow in the parking lot

from Kendrick Lamar – Sing About Me, I'm Dying of Thirst Lyrics on Rap Genius

Meaning

Keisha’s sister is selling her body for money, by any means necessary and this was her way of making a living.

The smartest lyrics of these lines & arguably of the whole song is the subtly brilliant “ass and shit”. Although it seems as if Kendrick’s just added “and shit”, for no particular reason, to the end to fit the rhyme scheme, the words are actually meaningful.

“Her nigga” is an ambiguous reference to either Keisha’s pimp or one of her customers, so there are two meanings to “and shit”:

In both cases, the fecal imagery Kendrick creates with “ass and shit” gets across the point that the world that these girls are a part of is filthy.

The preposition “behind” is also noteworthy, as it implies that she’s being “pushed” towards a dark future — this further reinforces Kendrick’s message about the hopelessness & inevitability of boys & girls getting sucked into gang life and prostitution, respectively. Just as we saw Dave’s brother follow Dave’s path, we’re seeing Keisha’s sister walking Keisha’s footsteps — a comment on the cyclic nature of poverty & destruction.

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