Cause if you did this round's on me
Just promise that you'll come back to me

from Kavinsky (Ft. The Weeknd) – Odd Look (The Weeknd Remix) Lyrics on Rap Genius

Meaning

If she feels like she got what she paid for, a good high, then Abel will give here a free “round” of pills, weed, etc. He uses a little bit of drugs as a bait to entice her to come back for more.

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