Her favorite cousin Demetrius's irrepetible
Family history of gang banging - did make me skeptical

from Kendrick Lamar – Sherane a.k.a. Master Splinter's Daughter Lyrics on Rap Genius

Meaning

Sherane has a cousin that’s a known gang banger, but he is so focused on sex that he ignores it.

This line is another example of the heavy foreshadowing going on in this song — Sherane’s gang ties come into play at the end of the track

The possessive of Demetrius allows for Kendrick to utilize his interesting diction with certain words.

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