duff

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up the duff

Pregnant. Primarily heard in UK, Ireland. You two have only been married for a couple of months, I can't believe you're up the duff already! I was pretty wild during my university years, which is how I found myself up the duff at 22.
See also: duff, up

be up the duff

slang To be pregnant. You two have only been married for a couple of months, I can't believe you're up the duff already!
See also: duff, up

up the duff

pregnant. British informal
1994 Daily Telegraph At 19, he was married (‘only because she was up the duff’ he explains gallantly).
See also: duff, up

duff

(dəf)
n. the buttocks. Don’t you get tired of sitting around on your duff?

get off one's duff

Get moving, become active. This slangy idiom uses duff in the sense of buttocks, a usage dating from about 1840 and at that time considered impolite. It no longer is, at least not in America, and if anything this cliché is a euphemism for still ruder synonyms, such as get off one’s butt or get off one’s ass.
See also: duff, get, off