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