It sounds to me like you must be referring to a 'master bathroom', which is normally 'off', or 'adjoining', the 'master bedroom'. The master bedroom is not necessarily 'off' the other [smaller] bedrooms. It is the largest bedroom in the house for the 'master' of the house and the master bathroom is an adjacent room connected to the master bedroom, generally for use only by the 'master' [and 'mistress'] (translation: father and mother) of the family.
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It sounds to me like you must be referring to a 'master bathroom', which is normally 'off', or 'adjoining', the 'master bedroom'. The master bedroom is not necessarily 'off' the other [smaller] bedrooms. It is the largest bedroom in the house for the 'master' of the house and the master bathroom is an adjacent room connected to the master bedroom, generally for use only by the 'm
No, "off" in this context means "adjacent", "connecting with".
Look here.
The master bedroom is directly connected to the bathroom and the closet.