Plural of biffy; British slang for bathrooms or toilets, particularly used in military or institutional contexts.
From 'biffy,' likely military slang derived from 'bio-facility' or a humorous corruption, or possibly from rhyming slang. Primarily British English, used informally in armed forces and schools.
Military slang is where 'biffies' thrives—servicemembers needed crude, quick humor to handle institutional life, and a silly word for toilet somehow made the indignity of military bathrooms slightly more bearable.
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