- Joined
- Nov 13, 2002
- Native Language
- British English
- Home Country
- UK
- Current Location
- Japan
You can get the definition of the idiom here.
A similar idiom (I mean, with the same meaning) is 'in the club' (an abbreviated form of "in the pudding club" - which is rarely if ever used).
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"Up the duff" is in some way linked to that phrase too. Don't ask me how. Something to do with duff pudding, which I've never even heard of.