Top Definition
The beautiful unification of Man's two great needs: Halo and Weed. Has numerous uses:

1. Exclamation of Joy, or Despair, during a marijuana influenced game of Halo Live.

2. Common piece name for Halo aficionados.
1. "MASTER KEEF!!! I am high."

2. "Ohhh shit, bro-ski's. Pass the Master Keef to me so that I may become high."
by Jonas Buntrock March 18, 2008

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