I already know, I've seen her at my show banging out XO all day

from Juicy J (Ft. The Weeknd) – One Of Those Nights Lyrics on Rap Genius

Meaning

XO is the combination of Ecstasy and Oxycontin, as well as a type of Hennessy and the name of The Weeknd’s clique. This line could either mean

  1. She’s going to his shows and getting high and drunk, or
  2. Is such a super fan and groupie, she’s having sexual relations with his clique

Most probably both, and the scene resembles this photo:

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