Green’s Dictionary of Slang

nonsensical, rubbish.

c.1572		G. Harvey letter to ‘M. Immerito’ [Edmund Spenser] in Smith Elizabethan Critical Essays (1904) 101: Our new famous enterprise for the exchanging of Barbarous and Balductum Rymes with Artificial Verses.
1577		Holinshed Chronicles (Ireland) II 29/2: The Irish doubtlesse repose a great affiance in this balducktum dreame.
1582		Stanyhurst Of Virgil his Æneis Dedication to Dvnsayne: Leaue too theese doltish coystrels theyre rude rhyming and balduckroom ballads.
1596		‘Misdiaboles’ Ulysses upon Ajax 15: I heard them in Paris [...] besides what balductum play is not full of them?