Green’s Dictionary of Slang

nonsense, rubbish.

1593		G. Harvey Pierce’s Supererogation 139: The stalest dudgeon, or absurdest balductum, that they, or their mates can inuent.
1617		S. Collins Defence Bishop Ely II viii 295: Will this balductum never be left? [F&H].
1822		R. Nares Gloss. (1888) I 47: †balductum. A mediaeval word meaning literally buttermilk, but it was used apparently in a burlesque sense for a paltry affected writer, and also for his compositions.