Means poor quality or badly made, the kind of flimsy nonsense that falls apart the second you look at it. You’ll hear it about cheap clothes, bargain electronics, or a bodge-job from a dodgy tradesman. If someone calls something shoddy, they’re basically saying it’s naff and not fit for purpose. Absolute mood, honestly.
"Got a bloke off Facebook to sort the boiler, now the kitchen’s doing indoor rain. Proper shoddy work. Should’ve gone with a real tradie, not Baz from the pub."