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1.
The name of an overpowering God, greater than all, who is sometimes referred to as "Rodrigo" or "leader of men." He holds everyone's highest respect.

Godmaster may be shortened to GM for colloquial use. When talking about "YOU" this is in reference to the Godmaster.
Diego: "YOU are the Godmaster!"

Rodrigo: "No YOU!"

Diego: "What a GM."
by Godmasterfan December 23, 2010
 
2.
A person that everything they do appeals to someone else.
A person that is greatly admired by another.
Johnny is Jake`s Godmaster.
by Cactuar May 05, 2003