Green’s Dictionary of Slang

fingle-fangle n.

[SE fangle, a foolish contrivance]

(Irish) an absurd creation.

‘In Laudis Navis Geminæ’ in Carpenter Verse in English from Tudor & Stuart Eng. (2003) 397: [of a ship] And with those Swabbers often jangle, / ’Cause none would sail his Finglefangle.