Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
JIFF-JAFFS, n.pl. A fit of depression or melancholy, the “blues”. Cf. colloq. Eng. jim-jams.w.Sc. 1898 J. M. Henderson Our Jeames 315:
The laddie's conduct is samething I cannat explain except that he has had a whiff o' the jiff-jaffs.