Popping pills in the lobby and I pray they don't find her naked

from Kendrick Lamar – Backseat Freestyle Lyrics on Rap Genius

Meaning

He popped pills with some girl in the lobby and he hopes they don’t find her dead and naked from overdosing because he’d then be charged. Goes back to the matrix line with blue/red pills.

This also references his last line. “Racing” can be used to describe someone high off ecstasy.

Kanye had a very similar set of bars a year later in his track “Blood On The Leaves” off of his album “Yeezus”:

Let’s take it back to the first party
When you tried your first molly
And came out of your body
And came out of your body
Running naked down the lobby
And you was screamin' that you love me

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