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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.
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 duffpregnant. British informal
1994 Daily Telegraph At 19, he was married (‘only because she was up the duff’ he explains gallantly).
n. the buttocks. Don’t you get tired of sitting around on your duff?