And in my downtime, since weed is a trend now, I sell it by pounds signs

from XV – Chaka Shao Khan Lyrics on Rap Genius

While XV is chilling he likes to tweet and or make music. He relates his music to weed and he usually lets people know when a new song is out.
It’s also word play
A pound of weed (mass of music) selling it with pound signs (approval). As if it was prescribed for you.

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