Top Definition
A room build or allocated for the sole purpose of spanking yer love hose, wanking in general or having a wankparty. Usually painted an off yellow colour and containing a sink and towels.
I will be back in a moment Im just going to polish my bishop in the Masterbaterium. Good boy, make sure you use the wanklock on the door.
by DrLoveNuts June 25, 2007
5 Words related to Masterbaterium

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