Bog-brained

To tar a chap of intelligence, wit and insight (and a cobbler-togetherer of exceedingly good popular musical tunes to boot) with the same mucky brush as the likes of Half Man Half Biscuit (who have just reformed. I think the question here is 'why, exactly?') will mark you out for life as a cauliflower-eared, bog-brained dolt, so there.

Source: wiktionary

But try telling these bog-brained murphies.

Source: wiktionary

It gives me an edge over all of yees around here, allows me see yees for the inbred, underbred, bog-brained shower yees are.

Source: wiktionary