
Up the duff
Slang Term
Used informally among friends or peers; not suitable in formal contexts like business or academia.

I heard from Ellie that she's just found out she's up the duff.
British Origin
Known mainly in the UK and other English-speaking countries may not be familiar with it.

When I used 'up the duff' in America, people didn't understand me.
Casual Language
It usually carries a casual or humorous tone, and may be considered impolite in serious situations.

My sister announced she was up the duff at the family dinner, and my grandma was not amused.
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