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Simply to masturbate whilst in the shower.
Western Australian slang;
Shaz = Shower.
Maz = Masturbate.
These words do not have to be used together and can also be used singularly, to abbreviate the respective words.
Person 1: "I'm off for a shaz and a maz."

Person 1: "I'm off for a maz."
Person 2: "I'm off for a shaz."
by --Daniel October 15, 2009
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