If you leave come back, like above your butt

from ScHoolboy Q (Ft. Ab-Soul, Black Hippy, Jay Rock & Kendrick Lamar) – Rolling Stone Lyrics on Rap Genius

Meaning

Above the butt is the back and Ab-Soul is also saying if you leave him please come directly back

Double entendre: if he pulls out when he’s making love with this girl, he should come on her back (backs are above your butt, homeboy)

For those who learn better with pictures of attractive women:

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