Green’s Dictionary of Slang

whifflegig adj.

[SE whiffle, to talk idly + gig n.2 (2)]

trivial, trifling.

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[UK]H. Lee Memoirs of a Manager 10: Not one of your puny punsters, or [...] whiffle-gig word-snappers. He made use of no metaphors, nor bandied about the bye-words of badinage.