And then she started...
And then she started feelin' herself like no one else in this apartment
Beg your pardon,
At the ensuing party, this female with Kendrick is speaking to him in private and very confidently, to the point that Kendrick acknowledges this and interrupts her…“Beg your pardon?”
She just took an Adderall so she’s very focused and confident in her conversation, where before she was partying (aloof) like everyone in the apartment. Adderall makes the user feel sober and focused, especially if they actually have adhd, which she does.
By saying “and then she started” as an unfinished sentence—compared to the detailed lyrics that follow— makes the listener have to wonder about the drug that she just took. It is very likely ecstasy (“feeling herself like no one else in this apartment”), but it is also very likely Adderall (see description above). Maybe she has a high tolerance and took them both at the same time. The unfinished-ness of this line can perhaps be a metaphor for all the drugs that people are abusing at this party.
But we may indeed be assured by this “you know what I meant when I said that” look on Kendrick’s face from the corresponding moment in the video
that this lyric means that she started to use SOME kind of drug.
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