British slang for a bathroom or toilet.
Derived from 'biff,' possibly from the brand name 'Biffins' or through rhyming slang connections. The term became popular in British military and school slang during the 20th century.
This word is a great example of how slang creates secret languages within groups—British schoolchildren and soldiers invented 'biffy' as a fun, coded way to talk about something mundane, which made it feel like insider knowledge.
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