Now I'm on my bat phone

from Chief Keef (Ft. Riff Raff) – Cuz My Gear Lyrics on Rap Genius

Meaning

The Batphone he refers to is the means by which important people close to him can contact him, without getting some manager or assistant.

i.e. Diplo in this tweet: https://twitter.com/#!/RiFFRaFF_SODMG/status/197148486729351168

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