She eyeing me like a nigga don't exist
Girl, I know you want this di--
from A$AP Rocky (Ft. 2 Chainz, Drake & Kendrick Lamar) – Fuckin' Problems Lyrics 2 on Rap Genius
Meaning
She’s playing hard to get and is acting like he doesn’t matter, but Kendrick knows that
she wants the D

The way he says, “Girl, I know you want this dick” is a reference to Martin Lawrence’s stand up You So Crazy.“ He also dresses like Martin at beginning of his verse in the video.
Anyway, this girl is staring right through Kendrick like he doesn’t exist, but he knows what she really wants.
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