Green’s Dictionary of Slang

usu. of (verse) writing, 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.
1588		J. Harvey Concerning Prophesies 40: [B]lind vnreasonable whimwhams, otherwhiles botched vp in Balductum méeter, otherwhiles bungled togither in paultry prose.
1596		‘Misdiaboles’ Ulysses upon Ajax 15: I heard them in Paris [...] besides what balductum play is not full of them?
1606		B. Rich Faultes faults, and nothing else but faultes n.p.: [B]ecause they can set downe a Balductum verse, doe thinke they haue recouered Virgils veine in Poetrie.
1619		J. Favour Antiquitie triumphing ouer noueltie 261: Then how impotent, and impudent, is a negatiue argument, from a balductum historian, an Abbot at most.
1622		J. Daw Iacke Davves prognostication 23: [N]ew schismaticall Opinions, and strange Sects [...] with other exoticke Niceties and Balductum diseases.